Attachment 12846 Details for Bug 12531 – Complete fix for master in git-am format.

[patch] Complete fix for master in git-am format.

shadow_copy_fix8 (text/plain), 60.53 KB, created by Jeremy Allison on 2017-01-23 19:04:34 UTC

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Creator: Jeremy Allison

Created: 2017-01-23 19:04:34 UTC

Size: 60.53 KB

patch

obsolete

>From 6076675a4f0ded3b9e343ed34f5b42dc5cbd5390 Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Wed, 11 Jan 2017 16:30:38 -0800
>Subject: [PATCH 01/16] s3: smbd: Correctly canonicalize any incoming shadow
> copy path.
>
>Converts to:
>
>@GMT-token/path/last_component
>
>from all incoming path types. Allows shadow_copy modules
>to work when current directory is changed after removing
>last component.
>
>Ultimately when the VFS ABI is changed to add a timestamp
>to struct smb_filename, this is where the parsing will be
>done.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/smbd/filename.c | 150 ++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 150 insertions(+)
>
>diff --git a/source3/smbd/filename.c b/source3/smbd/filename.c
>index a8cfb55b0f0..efe52a04328 100644
>--- a/source3/smbd/filename.c
>+++ b/source3/smbd/filename.c
>@@ -220,6 +220,148 @@ static NTSTATUS check_parent_exists(TALLOC_CTX *ctx,
> 	return NT_STATUS_OK;
> }
> 
>+/*
>+ * Re-order a known good @GMT-token path.
>+ */
>+
>+static NTSTATUS rearrange_snapshot_path(struct smb_filename *smb_fname,
>+				char *startp,
>+				char *endp)
>+{
>+	size_t endlen = 0;
>+	size_t gmt_len = endp - startp;
>+	char gmt_store[gmt_len + 1];
>+	char *parent = NULL;
>+	const char *last_component = NULL;
>+	char *newstr;
>+	bool ret;
>+
>+	DBG_DEBUG("|%s| -> ", smb_fname->base_name);
>+
>+	/* Save off the @GMT-token. */
>+	memcpy(gmt_store, startp, gmt_len);
>+	gmt_store[gmt_len] = '\0';
>+
>+	if (*endp == '/') {
>+		/* Remove any trailing '/' */
>+		endp++;
>+	}
>+
>+	if (*endp == '\0') {
>+		/*
>+		 * @GMT-token was at end of path.
>+		 * Remove any preceeding '/'
>+		 */
>+		if (startp > smb_fname->base_name && startp[-1] == '/') {
>+			startp--;
>+		}
>+	}
>+
>+	/* Remove @GMT-token from the path. */
>+	endlen = strlen(endp);
>+	memmove(startp, endp, endlen + 1);
>+
>+	/* Split the remaining path into components. */
>+	ret = parent_dirname(smb_fname,
>+				smb_fname->base_name,
>+				&parent,
>+				&last_component);
>+	if (ret == false) {
>+		/* Must terminate debug with \n */
>+		DBG_DEBUG("NT_STATUS_NO_MEMORY\n");
>+		return NT_STATUS_NO_MEMORY;
>+	}
>+
>+	if (ISDOT(parent)) {
>+		if (last_component[0] == '\0') {
>+			newstr = talloc_strdup(smb_fname,
>+					gmt_store);
>+		} else {
>+			newstr = talloc_asprintf(smb_fname,
>+					"%s/%s",
>+					gmt_store,
>+					last_component);
>+		}
>+	} else {
>+		newstr = talloc_asprintf(smb_fname,
>+					"%s/%s/%s",
>+					gmt_store,
>+					parent,
>+					last_component);
>+	}
>+
>+	TALLOC_FREE(parent);
>+	TALLOC_FREE(smb_fname->base_name);
>+	smb_fname->base_name = newstr;
>+
>+	DBG_DEBUG("|%s|\n", newstr);
>+
>+	return NT_STATUS_OK;
>+}
>+
>+/*
>+ * Canonicalize any incoming pathname potentially containining
>+ * a @GMT-token into a path that looks like:
>+ *
>+ * @GMT-YYYY-MM-DD-HH-MM-SS/path/name/components/last_component
>+ *
>+ * Leaves single path @GMT-token -component alone:
>+ *
>+ * @GMT-YYYY-MM-DD-HH-MM-SS -> @GMT-YYYY-MM-DD-HH-MM-SS
>+ *
>+ * Eventually when struct smb_filename is updated and the VFS
>+ * ABI is changed this will remove the @GMT-YYYY-MM-DD-HH-MM-SS
>+ * and store in the struct smb_filename as a struct timeval field
>+ * instead.
>+ */
>+
>+static NTSTATUS canonicalize_snapshot_path(struct smb_filename *smb_fname)
>+{
>+	char *startp = strchr_m(smb_fname->base_name, '@');
>+	char *endp = NULL;
>+	struct tm tm;
>+
>+	if (startp == NULL) {
>+		/* No @ */
>+		return NT_STATUS_OK;
>+	}
>+
>+	startp = strstr_m(startp, "@GMT-");
>+	if (startp == NULL) {
>+		/* No @ */
>+		return NT_STATUS_OK;
>+	}
>+
>+	if ((startp > smb_fname->base_name) && (startp[-1] != '/')) {
>+		/* the GMT-token does not start a path-component */
>+		return NT_STATUS_OK;
>+	}
>+
>+	endp = strptime(startp, GMT_FORMAT, &tm);
>+	if (endp == NULL) {
>+		/* Not a valid timestring. */
>+		return NT_STATUS_OK;
>+	}
>+
>+	if ( endp[0] == '\0') {
>+		return rearrange_snapshot_path(smb_fname,
>+					startp,
>+					endp);
>+	}
>+
>+	if (endp[0] != '/') {
>+		/*
>+		 * It is not a complete path component, i.e. the path
>+		 * component continues after the gmt-token.
>+		 */
>+		return NT_STATUS_OK;
>+	}
>+
>+	return rearrange_snapshot_path(smb_fname,
>+				startp,
>+				endp);
>+}
>+
> /****************************************************************************
> This routine is called to convert names from the dos namespace to unix
> namespace. It needs to handle any case conversions, mangling, format changes,
>@@ -356,6 +498,14 @@ NTSTATUS unix_convert(TALLOC_CTX *ctx,
> 		goto err;
> 	}
> 
>+	/* Canonicalize any @GMT- paths. */
>+	if (posix_pathnames == false) {
>+		status = canonicalize_snapshot_path(smb_fname);
>+		if (!NT_STATUS_IS_OK(status)) {
>+			goto err;
>+		}
>+	}
>+
> 	/*
> 	 * Large directory fix normalization. If we're case sensitive, and
> 	 * the case preserving parameters are set to "no", normalize the case of
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From 54deff61123f8ca049d5e045357d71e74f6ecf39 Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Tue, 17 Jan 2017 11:33:18 -0800
>Subject: [PATCH 02/16] s3: lib: Add canonicalize_absolute_path().
>
>We will be re-using this in several places.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/lib/util_path.c | 123 ++++++++++++++++++++++++++++++++++++++++++++++++
> source3/lib/util_path.h |   1 +
> 2 files changed, 124 insertions(+)
>
>diff --git a/source3/lib/util_path.c b/source3/lib/util_path.c
>index 509ba5ff727..888937d4fb4 100644
>--- a/source3/lib/util_path.c
>+++ b/source3/lib/util_path.c
>@@ -93,3 +93,126 @@ char *cache_path(const char *name)
> {
> 	return xx_path(name, lp_cache_directory());
> }
>+
>+char *canonicalize_absolute_path(TALLOC_CTX *ctx, const char *abs_path)
>+{
>+	char *destname;
>+	char *d;
>+	const char *s = abs_path;
>+	bool start_of_name_component = true;
>+
>+	/* Allocate for strlen + '\0' + possible leading '/' */
>+	destname = (char *)talloc_size(ctx, strlen(abs_path) + 2);
>+	if (destname == NULL) {
>+		return NULL;
>+        }
>+	d = destname;
>+
>+	*d++ = '/'; /* Always start with root. */
>+
>+	while (*s) {
>+		if (*s == '/') {
>+			/* Eat multiple '/' */
>+			while (*s == '/') {
>+				s++;
>+			}
>+			if ((d > destname + 1) && (*s != '\0')) {
>+				*d++ = '/';
>+			}
>+			start_of_name_component = true;
>+			continue;
>+		}
>+
>+		if (start_of_name_component) {
>+			if ((s[0] == '.') && (s[1] == '.') &&
>+					(s[2] == '/' || s[2] == '\0')) {
>+				/* Uh oh - "/../" or "/..\0" ! */
>+
>+				/* Go past the ../ or .. */
>+				if (s[2] == '/') {
>+					s += 3;
>+				} else {
>+					s += 2; /* Go past the .. */
>+				}
>+
>+				/* If  we just added a '/' - delete it */
>+				if ((d > destname) && (*(d-1) == '/')) {
>+					*(d-1) = '\0';
>+					d--;
>+				}
>+
>+				/*
>+				 * Are we at the start ?
>+				 * Can't go back further if so.
>+				 */
>+				if (d <= destname) {
>+					*d++ = '/'; /* Can't delete root */
>+					continue;
>+				}
>+				/* Go back one level... */
>+				/*
>+				 * Decrement d first as d points to
>+				 * the *next* char to write into.
>+				 */
>+				for (d--; d > destname; d--) {
>+					if (*d == '/') {
>+						break;
>+					}
>+				}
>+				/*
>+				 * We're still at the start of a name
>+				 * component, just the previous one.
>+				 */
>+				continue;
>+			} else if ((s[0] == '.') &&
>+					((s[1] == '\0') || s[1] == '/')) {
>+				/*
>+				 * Component of pathname can't be "." only.
>+				 * Skip the '.' .
>+				 */
>+				if (s[1] == '/') {
>+					s += 2;
>+				} else {
>+					s++;
>+				}
>+				continue;
>+			}
>+		}
>+
>+		if (!(*s & 0x80)) {
>+			*d++ = *s++;
>+		} else {
>+			size_t siz;
>+			/* Get the size of the next MB character. */
>+			next_codepoint(s,&siz);
>+			switch(siz) {
>+				case 5:
>+					*d++ = *s++;
>+					/*fall through*/
>+				case 4:
>+					*d++ = *s++;
>+					/*fall through*/
>+				case 3:
>+					*d++ = *s++;
>+					/*fall through*/
>+				case 2:
>+					*d++ = *s++;
>+					/*fall through*/
>+				case 1:
>+					*d++ = *s++;
>+					break;
>+				default:
>+					break;
>+			}
>+		}
>+		start_of_name_component = false;
>+	}
>+	*d = '\0';
>+
>+	/* And must not end in '/' */
>+	if (d > destname + 1 && (*(d-1) == '/')) {
>+		*(d-1) = '\0';
>+	}
>+
>+	return destname;
>+}
>diff --git a/source3/lib/util_path.h b/source3/lib/util_path.h
>index 118a4bed524..16e27926084 100644
>--- a/source3/lib/util_path.h
>+++ b/source3/lib/util_path.h
>@@ -27,5 +27,6 @@
> char *lock_path(const char *name);
> char *state_path(const char *name);
> char *cache_path(const char *name);
>+char *canonicalize_absolute_path(TALLOC_CTX *ctx, const char *abs_path);
> 
> #endif
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From fb725fd134ec451412944ff48ef1719a661ca52b Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Thu, 19 Jan 2017 15:18:41 -0800
>Subject: [PATCH 03/16] s3: lib: Fix old, old bug in set_conn_connectpath(),
> now in canonicalize_absolute_path().
>
>Canonicalizing a path of /foo/bar/../baz would return /foo/barbaz
>as moving forward 3 characters would delete the / character.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/lib/util_path.c | 8 ++------
> 1 file changed, 2 insertions(+), 6 deletions(-)
>
>diff --git a/source3/lib/util_path.c b/source3/lib/util_path.c
>index 888937d4fb4..0437ca11ac9 100644
>--- a/source3/lib/util_path.c
>+++ b/source3/lib/util_path.c
>@@ -128,12 +128,8 @@ char *canonicalize_absolute_path(TALLOC_CTX *ctx, const char *abs_path)
> 					(s[2] == '/' || s[2] == '\0')) {
> 				/* Uh oh - "/../" or "/..\0" ! */
> 
>-				/* Go past the ../ or .. */
>-				if (s[2] == '/') {
>-					s += 3;
>-				} else {
>-					s += 2; /* Go past the .. */
>-				}
>+				/* Go past the .. leaving us on the / or '\0' */
>+				s += 2;
> 
> 				/* If  we just added a '/' - delete it */
> 				if ((d > destname) && (*(d-1) == '/')) {
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From fabea9e4ca56cecb5244cc3602549371a78f0da0 Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Tue, 17 Jan 2017 11:35:52 -0800
>Subject: [PATCH 04/16] s3: smbd: Make set_conn_connectpath() call
> canonicalize_absolute_path().
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/smbd/service.c | 103 ++-----------------------------------------------
> 1 file changed, 3 insertions(+), 100 deletions(-)
>
>diff --git a/source3/smbd/service.c b/source3/smbd/service.c
>index 3308e9dce97..a0ac9dfa2af 100644
>--- a/source3/smbd/service.c
>+++ b/source3/smbd/service.c
>@@ -31,6 +31,7 @@
> #include "lib/param/loadparm.h"
> #include "messages.h"
> #include "lib/afs/afs_funcs.h"
>+#include "lib/util_path.h"
> 
> static bool canonicalize_connect_path(connection_struct *conn)
> {
>@@ -47,118 +48,20 @@ static bool canonicalize_connect_path(connection_struct *conn)
> /****************************************************************************
>  Ensure when setting connectpath it is a canonicalized (no ./ // or ../)
>  absolute path stating in / and not ending in /.
>- Observent people will notice a similarity between this and check_path_syntax :-).
> ****************************************************************************/
> 
> bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
> {
> 	char *destname;
>-	char *d;
>-	const char *s = connectpath;
>-        bool start_of_name_component = true;
> 
> 	if (connectpath == NULL || connectpath[0] == '\0') {
> 		return false;
> 	}
> 
>-	/* Allocate for strlen + '\0' + possible leading '/' */
>-	destname = (char *)talloc_size(conn, strlen(connectpath) + 2);
>-	if (!destname) {
>+	destname = canonicalize_absolute_path(conn, connectpath);
>+	if (destname == NULL) {
> 		return false;
> 	}
>-	d = destname;
>-
>-	*d++ = '/'; /* Always start with root. */
>-
>-	while (*s) {
>-		if (*s == '/') {
>-			/* Eat multiple '/' */
>-			while (*s == '/') {
>-                                s++;
>-                        }
>-			if ((d > destname + 1) && (*s != '\0')) {
>-				*d++ = '/';
>-			}
>-			start_of_name_component = True;
>-			continue;
>-		}
>-
>-		if (start_of_name_component) {
>-			if ((s[0] == '.') && (s[1] == '.') && (s[2] == '/' || s[2] == '\0')) {
>-				/* Uh oh - "/../" or "/..\0" ! */
>-
>-				/* Go past the ../ or .. */
>-				if (s[2] == '/') {
>-					s += 3;
>-				} else {
>-					s += 2; /* Go past the .. */
>-				}
>-
>-				/* If  we just added a '/' - delete it */
>-				if ((d > destname) && (*(d-1) == '/')) {
>-					*(d-1) = '\0';
>-					d--;
>-				}
>-
>-				/* Are we at the start ? Can't go back further if so. */
>-				if (d <= destname) {
>-					*d++ = '/'; /* Can't delete root */
>-					continue;
>-				}
>-				/* Go back one level... */
>-				/* Decrement d first as d points to the *next* char to write into. */
>-				for (d--; d > destname; d--) {
>-					if (*d == '/') {
>-						break;
>-					}
>-				}
>-				/* We're still at the start of a name component, just the previous one. */
>-				continue;
>-			} else if ((s[0] == '.') && ((s[1] == '\0') || s[1] == '/')) {
>-				/* Component of pathname can't be "." only - skip the '.' . */
>-				if (s[1] == '/') {
>-					s += 2;
>-				} else {
>-					s++;
>-				}
>-				continue;
>-			}
>-		}
>-
>-		if (!(*s & 0x80)) {
>-			*d++ = *s++;
>-		} else {
>-			size_t siz;
>-			/* Get the size of the next MB character. */
>-			next_codepoint(s,&siz);
>-			switch(siz) {
>-				case 5:
>-					*d++ = *s++;
>-					/*fall through*/
>-				case 4:
>-					*d++ = *s++;
>-					/*fall through*/
>-				case 3:
>-					*d++ = *s++;
>-					/*fall through*/
>-				case 2:
>-					*d++ = *s++;
>-					/*fall through*/
>-				case 1:
>-					*d++ = *s++;
>-					break;
>-				default:
>-					break;
>-			}
>-		}
>-		start_of_name_component = false;
>-	}
>-	*d = '\0';
>-
>-	/* And must not end in '/' */
>-	if (d > destname + 1 && (*(d-1) == '/')) {
>-		*(d-1) = '\0';
>-	}
> 
> 	DEBUG(10,("set_conn_connectpath: service %s, connectpath = %s\n",
> 		lp_servicename(talloc_tos(), SNUM(conn)), destname ));
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From 85cf20caec7f87cabba8fd2c76363f39109e6c49 Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Fri, 20 Jan 2017 11:42:39 -0800
>Subject: [PATCH 05/16] s3: VFS: shadow_copy2: Correctly initialize timestamp
> and stripped variables.
>
>Allow the called functions to be fixed to not touch them on error.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/modules/vfs_shadow_copy2.c | 107 +++++++++++++++++++------------------
> 1 file changed, 55 insertions(+), 52 deletions(-)
>
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index 6a25c87b7f7..10c8e2e1c11 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -416,10 +416,10 @@ static bool shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
> 					char **pstripped)
> {
> 	struct tm tm;
>-	time_t timestamp;
>+	time_t timestamp = 0;
> 	const char *p;
> 	char *q;
>-	char *stripped;
>+	char *stripped = NULL;
> 	size_t rest_len, dst_len;
> 	struct shadow_copy2_private *priv;
> 	const char *snapdir;
>@@ -893,8 +893,8 @@ static DIR *shadow_copy2_opendir(vfs_handle_struct *handle,
> 			const char *mask,
> 			uint32_t attr)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	DIR *ret;
> 	int saved_errno;
> 	char *conv;
>@@ -1002,8 +1002,9 @@ static int shadow_copy2_link(vfs_handle_struct *handle,
> static int shadow_copy2_stat(vfs_handle_struct *handle,
> 			     struct smb_filename *smb_fname)
> {
>-	time_t timestamp;
>-	char *stripped, *tmp;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
>+	char *tmp;
> 	int ret, saved_errno;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
>@@ -1041,8 +1042,9 @@ static int shadow_copy2_stat(vfs_handle_struct *handle,
> static int shadow_copy2_lstat(vfs_handle_struct *handle,
> 			      struct smb_filename *smb_fname)
> {
>-	time_t timestamp;
>-	char *stripped, *tmp;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
>+	char *tmp;
> 	int ret, saved_errno;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
>@@ -1080,7 +1082,7 @@ static int shadow_copy2_lstat(vfs_handle_struct *handle,
> static int shadow_copy2_fstat(vfs_handle_struct *handle, files_struct *fsp,
> 			      SMB_STRUCT_STAT *sbuf)
> {
>-	time_t timestamp;
>+	time_t timestamp = 0;
> 	int ret;
> 
> 	ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
>@@ -1102,8 +1104,9 @@ static int shadow_copy2_open(vfs_handle_struct *handle,
> 			     struct smb_filename *smb_fname, files_struct *fsp,
> 			     int flags, mode_t mode)
> {
>-	time_t timestamp;
>-	char *stripped, *tmp;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
>+	char *tmp;
> 	int ret, saved_errno;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
>@@ -1138,8 +1141,8 @@ static int shadow_copy2_open(vfs_handle_struct *handle,
> static int shadow_copy2_unlink(vfs_handle_struct *handle,
> 			       const struct smb_filename *smb_fname)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	int ret, saved_errno;
> 	struct smb_filename *conv;
> 
>@@ -1173,7 +1176,7 @@ static int shadow_copy2_chmod(vfs_handle_struct *handle,
> 			const struct smb_filename *smb_fname,
> 			mode_t mode)
> {
>-	time_t timestamp;
>+	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	int ret, saved_errno;
> 	char *conv = NULL;
>@@ -1219,8 +1222,8 @@ static int shadow_copy2_chown(vfs_handle_struct *handle,
> 			uid_t uid,
> 			gid_t gid)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	int ret, saved_errno;
> 	char *conv = NULL;
> 	struct smb_filename *conv_smb_fname = NULL;
>@@ -1261,8 +1264,8 @@ static int shadow_copy2_chown(vfs_handle_struct *handle,
> static int shadow_copy2_chdir(vfs_handle_struct *handle,
> 			      const char *fname)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	int ret, saved_errno;
> 	char *conv;
> 
>@@ -1289,8 +1292,8 @@ static int shadow_copy2_ntimes(vfs_handle_struct *handle,
> 			       const struct smb_filename *smb_fname,
> 			       struct smb_file_time *ft)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	int ret, saved_errno;
> 	struct smb_filename *conv;
> 
>@@ -1323,8 +1326,8 @@ static int shadow_copy2_ntimes(vfs_handle_struct *handle,
> static int shadow_copy2_readlink(vfs_handle_struct *handle,
> 				 const char *fname, char *buf, size_t bufsiz)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	int ret, saved_errno;
> 	char *conv;
> 
>@@ -1350,8 +1353,8 @@ static int shadow_copy2_readlink(vfs_handle_struct *handle,
> static int shadow_copy2_mknod(vfs_handle_struct *handle,
> 			      const char *fname, mode_t mode, SMB_DEV_T dev)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	int ret, saved_errno;
> 	char *conv;
> 
>@@ -1377,7 +1380,7 @@ static int shadow_copy2_mknod(vfs_handle_struct *handle,
> static char *shadow_copy2_realpath(vfs_handle_struct *handle,
> 				   const char *fname)
> {
>-	time_t timestamp;
>+	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	char *tmp = NULL;
> 	char *result = NULL;
>@@ -1805,8 +1808,8 @@ static NTSTATUS shadow_copy2_fget_nt_acl(vfs_handle_struct *handle,
> 					 TALLOC_CTX *mem_ctx,
> 					struct security_descriptor **ppdesc)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	NTSTATUS status;
> 	char *conv;
> 	struct smb_filename *smb_fname = NULL;
>@@ -1849,8 +1852,8 @@ static NTSTATUS shadow_copy2_get_nt_acl(vfs_handle_struct *handle,
> 					TALLOC_CTX *mem_ctx,
> 					struct security_descriptor **ppdesc)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	NTSTATUS status;
> 	char *conv;
> 	struct smb_filename *conv_smb_fname = NULL;
>@@ -1891,8 +1894,8 @@ static int shadow_copy2_mkdir(vfs_handle_struct *handle,
> 				const struct smb_filename *smb_fname,
> 				mode_t mode)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	int ret, saved_errno;
> 	char *conv;
> 	struct smb_filename *conv_smb_fname = NULL;
>@@ -1932,8 +1935,8 @@ static int shadow_copy2_mkdir(vfs_handle_struct *handle,
> static int shadow_copy2_rmdir(vfs_handle_struct *handle,
> 				const struct smb_filename *smb_fname)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	int ret, saved_errno;
> 	char *conv;
> 	struct smb_filename *conv_smb_fname = NULL;
>@@ -1973,8 +1976,8 @@ static int shadow_copy2_rmdir(vfs_handle_struct *handle,
> static int shadow_copy2_chflags(vfs_handle_struct *handle, const char *fname,
> 				unsigned int flags)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	int ret, saved_errno;
> 	char *conv;
> 
>@@ -2001,8 +2004,8 @@ static ssize_t shadow_copy2_getxattr(vfs_handle_struct *handle,
> 				     const char *fname, const char *aname,
> 				     void *value, size_t size)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	ssize_t ret;
> 	int saved_errno;
> 	char *conv;
>@@ -2031,8 +2034,8 @@ static ssize_t shadow_copy2_listxattr(struct vfs_handle_struct *handle,
> 				      const char *fname,
> 				      char *list, size_t size)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	ssize_t ret;
> 	int saved_errno;
> 	char *conv;
>@@ -2059,8 +2062,8 @@ static ssize_t shadow_copy2_listxattr(struct vfs_handle_struct *handle,
> static int shadow_copy2_removexattr(vfs_handle_struct *handle,
> 				    const char *fname, const char *aname)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	int ret, saved_errno;
> 	char *conv;
> 
>@@ -2088,8 +2091,8 @@ static int shadow_copy2_setxattr(struct vfs_handle_struct *handle,
> 				 const char *aname, const void *value,
> 				 size_t size, int flags)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	ssize_t ret;
> 	int saved_errno;
> 	char *conv;
>@@ -2118,8 +2121,8 @@ static int shadow_copy2_chmod_acl(vfs_handle_struct *handle,
> 			const struct smb_filename *smb_fname,
> 			mode_t mode)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	ssize_t ret;
> 	int saved_errno;
> 	char *conv = NULL;
>@@ -2164,8 +2167,8 @@ static int shadow_copy2_get_real_filename(struct vfs_handle_struct *handle,
> 					  TALLOC_CTX *mem_ctx,
> 					  char **found_name)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	ssize_t ret;
> 	int saved_errno;
> 	char *conv;
>@@ -2203,7 +2206,7 @@ static int shadow_copy2_get_real_filename(struct vfs_handle_struct *handle,
> static const char *shadow_copy2_connectpath(struct vfs_handle_struct *handle,
> 					    const char *fname)
> {
>-	time_t timestamp;
>+	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	char *tmp = NULL;
> 	char *result = NULL;
>@@ -2278,8 +2281,8 @@ static uint64_t shadow_copy2_disk_free(vfs_handle_struct *handle,
> 				       const char *path, uint64_t *bsize,
> 				       uint64_t *dfree, uint64_t *dsize)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	ssize_t ret;
> 	int saved_errno;
> 	char *conv;
>@@ -2312,8 +2315,8 @@ static int shadow_copy2_get_quota(vfs_handle_struct *handle, const char *path,
> 				  enum SMB_QUOTA_TYPE qtype, unid_t id,
> 				  SMB_DISK_QUOTA *dq)
> {
>-	time_t timestamp;
>-	char *stripped;
>+	time_t timestamp = 0;
>+	char *stripped = NULL;
> 	int ret;
> 	int saved_errno;
> 	char *conv;
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From f0b25e8026f17d70dfa3772c89565473d5b18498 Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Fri, 20 Jan 2017 11:45:54 -0800
>Subject: [PATCH 06/16] s3: VFS: shadow_copy2: Ensure pathnames for parameters
> are correctly relative and terminated.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/modules/vfs_shadow_copy2.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index 10c8e2e1c11..34b86068dae 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -2623,6 +2623,11 @@ static int shadow_copy2_connect(struct vfs_handle_struct *handle,
> 		}
> 	}
> 
>+	trim_string(config->mount_point, NULL, "/");
>+	trim_string(config->rel_connectpath, "/", "/");
>+	trim_string(config->snapdir, NULL, "/");
>+	trim_string(config->snapshot_basepath, NULL, "/");
>+
> 	DEBUG(10, ("shadow_copy2_connect: configuration:\n"
> 		   "  share root: '%s'\n"
> 		   "  mountpoint: '%s'\n"
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From 6d7c9dafaf5e7eb995272bfcdf222a515cc1b875 Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Fri, 20 Jan 2017 11:48:40 -0800
>Subject: [PATCH 07/16] s3: VFS: shadow_copy2: Fix length comparison to ensure
> we don't overstep a length.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/modules/vfs_shadow_copy2.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index 34b86068dae..27cd4f72b81 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -2585,7 +2585,7 @@ static int shadow_copy2_connect(struct vfs_handle_struct *handle,
> 	}
> 
> 	if (config->rel_connectpath == NULL &&
>-	    strlen(basedir) != strlen(handle->conn->connectpath)) {
>+	    strlen(basedir) < strlen(handle->conn->connectpath)) {
> 		config->rel_connectpath = talloc_strdup(config,
> 			handle->conn->connectpath + strlen(basedir));
> 		if (config->rel_connectpath == NULL) {
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From b04cb0ae9b81904ec251de6af3867ad1cfde8335 Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Fri, 20 Jan 2017 11:50:49 -0800
>Subject: [PATCH 08/16] s3: VFS: shadow_copy2: Add two new variables to the
> private data. Not yet used.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/modules/vfs_shadow_copy2.c | 3 +++
> 1 file changed, 3 insertions(+)
>
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index 27cd4f72b81..f957d3c6cb9 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -74,6 +74,9 @@ struct shadow_copy2_snaplist_info {
> struct shadow_copy2_private {
> 	struct shadow_copy2_config *config;
> 	struct shadow_copy2_snaplist_info *snaps;
>+	char *shadow_cwd; /* Absolute $cwd path. */
>+	/* Absolute connectpath - can vary depending on $cwd. */
>+	char *shadow_connectpath;
> };
> 
> static int shadow_copy2_get_shadow_copy_data(
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From f1500f7a2d2a3399f7197cd555f8b9b3a6fcfd5b Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Fri, 20 Jan 2017 11:54:56 -0800
>Subject: [PATCH 09/16] s3: VFS: shadow_copy2: Add a wrapper function to call
> the original shadow_copy2_strip_snapshot().
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Allows an extra (currently unused) parameter to be added.
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/modules/vfs_shadow_copy2.c | 19 +++++++++++++++++--
> 1 file changed, 17 insertions(+), 2 deletions(-)
>
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index f957d3c6cb9..5031ab36a6c 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -412,11 +412,12 @@ static char *shadow_copy2_snapshot_path(TALLOC_CTX *mem_ctx,
>  * handed in via the smb layer.
>  * Returns the parsed timestamp and the stripped filename.
>  */
>-static bool shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
>+static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 					struct vfs_handle_struct *handle,
> 					const char *name,
> 					time_t *ptimestamp,
>-					char **pstripped)
>+					char **pstripped,
>+					char **psnappath)
> {
> 	struct tm tm;
> 	time_t timestamp = 0;
>@@ -598,6 +599,20 @@ no_snapshot:
> 	return true;
> }
> 
>+static bool shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
>+					struct vfs_handle_struct *handle,
>+					const char *orig_name,
>+					time_t *ptimestamp,
>+					char **pstripped)
>+{
>+	return shadow_copy2_strip_snapshot_internal(mem_ctx,
>+					handle,
>+					orig_name,
>+					ptimestamp,
>+					pstripped,
>+					NULL);
>+}
>+
> static char *shadow_copy2_find_mount_point(TALLOC_CTX *mem_ctx,
> 					   vfs_handle_struct *handle)
> {
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From 51ad0eb161ef7875f8ddb3bac380dc3c0959f96f Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Fri, 20 Jan 2017 11:56:21 -0800
>Subject: [PATCH 10/16] s3: VFS: shadow_copy2: Change a parameter name.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Allows easy substitution later.
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/modules/vfs_shadow_copy2.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index 5031ab36a6c..a94a0ae5605 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -414,7 +414,7 @@ static char *shadow_copy2_snapshot_path(TALLOC_CTX *mem_ctx,
>  */
> static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 					struct vfs_handle_struct *handle,
>-					const char *name,
>+					const char *orig_name,
> 					time_t *ptimestamp,
> 					char **pstripped,
> 					char **psnappath)
>@@ -429,6 +429,7 @@ static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 	const char *snapdir;
> 	ssize_t snapdirlen;
> 	ptrdiff_t len_before_gmt;
>+	const char *name = orig_name;
> 
> 	SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
> 				return false);
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From 7531c2ae365c8c943485e9a5bdf2f721235dee05 Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Fri, 20 Jan 2017 12:00:08 -0800
>Subject: [PATCH 11/16] s3: VFS: shadow_copy2: Add two currently unused
> functions to make pathnames absolute or relative to $cwd.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/modules/vfs_shadow_copy2.c | 45 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 45 insertions(+)
>
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index a94a0ae5605..e781612df88 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -35,6 +35,7 @@
> #include "system/filesys.h"
> #include "include/ntioctl.h"
> #include "util_tdb.h"
>+#include "lib/util_path.h"
> 
> struct shadow_copy2_config {
> 	char *gmt_format;
>@@ -407,6 +408,50 @@ static char *shadow_copy2_snapshot_path(TALLOC_CTX *mem_ctx,
> 	return result;
> }
> 
>+static char *make_path_absolute(TALLOC_CTX *mem_ctx,
>+				struct shadow_copy2_private *priv,
>+				const char *name)
>+{
>+	char *newpath = NULL;
>+	char *abs_path = NULL;
>+
>+	if (name[0] != '/') {
>+		newpath = talloc_asprintf(mem_ctx,
>+					"%s/%s",
>+					priv->shadow_cwd,
>+					name);
>+		if (newpath == NULL) {
>+			return NULL;
>+		}
>+		name = newpath;
>+	}
>+	abs_path = canonicalize_absolute_path(mem_ctx, name);
>+	TALLOC_FREE(newpath);
>+	return abs_path;
>+}
>+
>+/* Return a $cwd-relative path. */
>+static bool make_relative_path(const char *cwd, char *abs_path)
>+{
>+	size_t cwd_len = strlen(cwd);
>+	size_t abs_len = strlen(abs_path);
>+
>+	if (abs_len < cwd_len) {
>+		return false;
>+	}
>+	if (memcmp(abs_path, cwd, cwd_len) != 0) {
>+		return false;
>+	}
>+	if (abs_path[cwd_len] != '/' && abs_path[cwd_len] != '\0') {
>+		return false;
>+	}
>+	if (abs_path[cwd_len] == '/') {
>+		cwd_len++;
>+	}
>+	memmove(abs_path, &abs_path[cwd_len], abs_len + 1 - cwd_len);
>+	return true;
>+}
>+
> /**
>  * Strip a snapshot component from a filename as
>  * handed in via the smb layer.
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From b8a4d954f205f5e46232227d8eb8bf6012cd4cf8 Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Fri, 20 Jan 2017 12:06:55 -0800
>Subject: [PATCH 12/16] s3: VFS: shadow_copy2: Fix chdir to store off the
> needed private variables.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>This is not yet used, the users of this will be added later.
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/modules/vfs_shadow_copy2.c | 81 ++++++++++++++++++++++++++++++++------
> 1 file changed, 68 insertions(+), 13 deletions(-)
>
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index e781612df88..d7037a9e232 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -1325,30 +1325,85 @@ static int shadow_copy2_chown(vfs_handle_struct *handle,
> 	return ret;
> }
> 
>+static void store_cwd_data(vfs_handle_struct *handle,
>+				const char *connectpath)
>+{
>+	struct shadow_copy2_private *priv = NULL;
>+	char *cwd = NULL;
>+
>+	SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
>+				return);
>+
>+	TALLOC_FREE(priv->shadow_cwd);
>+	cwd = SMB_VFS_NEXT_GETWD(handle);
>+	if (cwd == NULL) {
>+		smb_panic("getwd failed\n");
>+	}
>+	DBG_DEBUG("shadow cwd = %s\n", cwd);
>+	priv->shadow_cwd = talloc_strdup(priv, cwd);
>+	SAFE_FREE(cwd);
>+	if (priv->shadow_cwd == NULL) {
>+		smb_panic("talloc failed\n");
>+	}
>+	TALLOC_FREE(priv->shadow_connectpath);
>+	if (connectpath) {
>+		DBG_DEBUG("shadow conectpath = %s\n", connectpath);
>+		priv->shadow_connectpath = talloc_strdup(priv, connectpath);
>+		if (priv->shadow_connectpath == NULL) {
>+			smb_panic("talloc failed\n");
>+		}
>+	}
>+}
>+
> static int shadow_copy2_chdir(vfs_handle_struct *handle,
> 			      const char *fname)
> {
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
>-	int ret, saved_errno;
>-	char *conv;
>+	char *snappath = NULL;
>+	int ret = -1;
>+	int saved_errno = 0;
>+	char *conv = NULL;
>+	size_t rootpath_len = 0;
> 
>-	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
>-					 &timestamp, &stripped)) {
>+	if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle, fname,
>+					&timestamp, &stripped, &snappath)) {
> 		return -1;
> 	}
>-	if (timestamp == 0) {
>-		return SMB_VFS_NEXT_CHDIR(handle, fname);
>+	if (stripped != NULL) {
>+		conv = shadow_copy2_do_convert(talloc_tos(),
>+						handle,
>+						stripped,
>+						timestamp,
>+						&rootpath_len);
>+		TALLOC_FREE(stripped);
>+		if (conv == NULL) {
>+			return -1;
>+		}
>+		fname = conv;
> 	}
>-	conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
>-	TALLOC_FREE(stripped);
>-	if (conv == NULL) {
>-		return -1;
>+
>+	ret = SMB_VFS_NEXT_CHDIR(handle, fname);
>+	if (ret == -1) {
>+		saved_errno = errno;
> 	}
>-	ret = SMB_VFS_NEXT_CHDIR(handle, conv);
>-	saved_errno = errno;
>+
>+	if (ret == 0) {
>+		if (conv != NULL && rootpath_len != 0) {
>+			conv[rootpath_len] = '\0';
>+		} else if (snappath != 0) {
>+			TALLOC_FREE(conv);
>+			conv = snappath;
>+		}
>+		store_cwd_data(handle, conv);
>+	}
>+
>+	TALLOC_FREE(stripped);
> 	TALLOC_FREE(conv);
>-	errno = saved_errno;
>+
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From 133234d0f09dec304c893ab466c1d9f9d1de1bd6 Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Fri, 20 Jan 2017 12:09:08 -0800
>Subject: [PATCH 13/16] s3: VFS: Allow shadow_copy2_connectpath() to return the
> cached path derived from $cwd.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/modules/vfs_shadow_copy2.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index d7037a9e232..8ac6971cfe4 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -2332,9 +2332,19 @@ static const char *shadow_copy2_connectpath(struct vfs_handle_struct *handle,
> 	char *parent_dir = NULL;
> 	int saved_errno;
> 	size_t rootpath_len = 0;
>+	struct shadow_copy2_private *priv = NULL;
>+
>+	SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
>+				return NULL);
> 
> 	DBG_DEBUG("Calc connect path for [%s]\n", fname);
> 
>+	if (priv->shadow_connectpath != NULL) {
>+		DBG_DEBUG("cached connect path is [%s]\n",
>+			priv->shadow_connectpath);
>+		return priv->shadow_connectpath;
>+	}
>+
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
> 					 &timestamp, &stripped)) {
> 		goto done;
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From 7cf3d853b331fd9372f582fe99eb9354ac39ffbe Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Fri, 20 Jan 2017 12:33:23 -0800
>Subject: [PATCH 14/16] s3: VFS: shadow_copy2: Fix module to work with variable
> current working directory.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/modules/vfs_shadow_copy2.c | 148 ++++++++++++++++++++++++++++++-------
> 1 file changed, 122 insertions(+), 26 deletions(-)
>
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index 8ac6971cfe4..89a73d09b0a 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -453,9 +453,23 @@ static bool make_relative_path(const char *cwd, char *abs_path)
> }
> 
> /**
>- * Strip a snapshot component from a filename as
>- * handed in via the smb layer.
>- * Returns the parsed timestamp and the stripped filename.
>+ * This function does two things.
>+ *
>+ * 1). Checks if an incoming filename contains an
>+ * SMB-layer @GMT- style timestamp.
>+ * 	If so, it strips the timestamp, and returns
>+ *	both the timestamp and the stripped path
>+ *	(making it cwd-relative).
>+ *
>+ * 2). Checks if an incoming filename is already a
>+ * snapshot converted pathname.
>+ *	If so, it returns the pathname truncated
>+ *	at the snapshot point which will be used
>+ *	as the connectpath, and then does an early return.
>+ *
>+ * FIXME. This function is an utter mess, and is in desperate
>+ * need of a complete refactoring. A task for another day
>+ * though.
>  */
> static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 					struct vfs_handle_struct *handle,
>@@ -475,22 +489,33 @@ static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 	ssize_t snapdirlen;
> 	ptrdiff_t len_before_gmt;
> 	const char *name = orig_name;
>+	char *abs_path = NULL;
>+	int ret = true;
> 
> 	SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
> 				return false);
> 
> 	DEBUG(10, (__location__ ": enter path '%s'\n", name));
> 
>+	abs_path = make_path_absolute(mem_ctx, priv, name);
>+	if (abs_path == NULL) {
>+		ret = false;
>+		goto out;
>+	}
>+	name = abs_path;
>+
>+	DEBUG(10, (__location__ ": abs path '%s'\n", name));
>+
> 	p = strstr_m(name, "@GMT-");
> 	if (p == NULL) {
> 		DEBUG(11, ("@GMT not found\n"));
>-		goto no_snapshot;
>+		goto out;
> 	}
> 	if ((p > name) && (p[-1] != '/')) {
> 		/* the GMT-token does not start a path-component */
> 		DEBUG(10, ("not at start, p=%p, name=%p, p[-1]=%d\n",
> 			   p, name, (int)p[-1]));
>-		goto no_snapshot;
>+		goto out;
> 	}
> 
> 	/*
>@@ -514,19 +539,43 @@ static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 
> 		if (strncmp(parent_snapdir, snapdir, snapdirlen) == 0) {
> 			DEBUG(10, ("name=%s is already converted\n", name));
>-			goto no_snapshot;
>+			if (psnappath) {
>+				/*
>+				 * Need to return up to the next path
>+				 * component after the @GMT-.
>+				 * This will be used as the connectpath.
>+				 */
>+				q = strchr(p, '/');
>+				if (q == NULL) {
>+					/*
>+					 * No next path component.
>+					 * Just return entire string.
>+					 */
>+					*psnappath = talloc_strdup(mem_ctx,
>+								name);
>+				} else {
>+					*psnappath = talloc_strndup(mem_ctx,
>+							name,
>+							q - name);
>+				}
>+				if (*psnappath == NULL) {
>+					ret = false;
>+					goto out;
>+				}
>+			}
>+			goto out;
> 		}
> 	}
> 	q = strptime(p, GMT_FORMAT, &tm);
> 	if (q == NULL) {
> 		DEBUG(10, ("strptime failed\n"));
>-		goto no_snapshot;
>+		goto out;
> 	}
> 	tm.tm_isdst = -1;
> 	timestamp = timegm(&tm);
> 	if (timestamp == (time_t)-1) {
> 		DEBUG(10, ("timestamp==-1\n"));
>-		goto no_snapshot;
>+		goto out;
> 	}
> 	if (q[0] == '\0') {
> 		/*
>@@ -546,12 +595,24 @@ static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 			stripped = talloc_strndup(mem_ctx, name,
> 					len_before_gmt);
> 			if (stripped == NULL) {
>-				return false;
>+				ret = false;
>+				goto out;
>+			}
>+			if (orig_name[0] != '/') {
>+				if (make_relative_path(priv->shadow_cwd,
>+						stripped) == false) {
>+					DEBUG(10, (__location__ ": path '%s' "
>+						"doesn't start with cwd '%s\n",
>+						stripped, priv->shadow_cwd));
>+						ret = false;
>+					errno = ENOENT;
>+					goto out;
>+				}
> 			}
> 			*pstripped = stripped;
> 		}
> 		*ptimestamp = timestamp;
>-		return true;
>+		goto out;
> 	}
> 	if (q[0] != '/') {
> 		/*
>@@ -559,7 +620,7 @@ static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 		 * component continues after the gmt-token.
> 		 */
> 		DEBUG(10, ("q[0] = %d\n", (int)q[0]));
>-		goto no_snapshot;
>+		goto out;
> 	}
> 	q += 1;
> 
>@@ -568,7 +629,7 @@ static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 
> 	if (priv->config->snapdirseverywhere) {
> 		char *insert;
>-		bool have_insert;
>+		char *have_insert;
> 		insert = shadow_copy2_insert_string(talloc_tos(), handle,
> 						    timestamp);
> 		if (insert == NULL) {
>@@ -580,15 +641,28 @@ static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 			   "path '%s'.\n"
> 			   "insert string '%s'\n", name, insert));
> 
>-		have_insert = (strstr(name, insert+1) != NULL);
>-		DEBUG(10, ("have_insert=%d, name=%s, insert+1=%s\n",
>-			   (int)have_insert, name, insert+1));
>-		if (have_insert) {
>+		have_insert = strstr(name, insert+1);
>+		DEBUG(10, ("have_insert=%s, name=%s, insert+1=%s\n",
>+			have_insert ? have_insert : "", name, insert+1));
>+		if (have_insert != NULL) {
> 			DEBUG(10, (__location__ ": insert string '%s' found in "
> 				   "path '%s' found in snapdirseverywhere mode "
> 				   "==> already converted\n", insert, name));
>+			if (psnappath) {
>+				/*
>+				 * This will be used as the connectpath.
>+				 */
>+				size_t insertlen = strlen(insert);
>+				*psnappath = talloc_strndup(mem_ctx,
>+						name,
>+						have_insert - name + insertlen);
>+				if (*psnappath == NULL) {
>+					ret = false;
>+					goto out;
>+				}
>+			}
> 			TALLOC_FREE(insert);
>-			goto no_snapshot;
>+			goto out;
> 		}
> 		TALLOC_FREE(insert);
> 	} else {
>@@ -599,8 +673,8 @@ static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 							   handle,
> 							   timestamp);
> 		if (snapshot_path == NULL) {
>-			errno = ENOMEM;
>-			return false;
>+			ret = false;
>+			goto out;
> 		}
> 
> 		DEBUG(10, (__location__ " path: '%s'.\n"
>@@ -613,12 +687,22 @@ static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 			 * so it is already a converted absolute
> 			 * path. Don't process further.
> 			 */
>+			if (psnappath) {
>+				size_t slen = strlen(snapshot_path);
>+				*psnappath = talloc_strndup(mem_ctx,
>+							name,
>+							slen);
>+				if (*psnappath == NULL) {
>+					ret = false;
>+					goto out;
>+				}
>+			}
> 			DEBUG(10, (__location__ ": path '%s' starts with "
> 				   "snapshot path '%s' (not in "
> 				   "snapdirseverywhere mode) ==> "
> 				   "already converted\n", name, snapshot_path));
> 			talloc_free(snapshot_path);
>-			goto no_snapshot;
>+			goto out;
> 		}
> 		talloc_free(snapshot_path);
> 	}
>@@ -626,8 +710,8 @@ static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 	if (pstripped != NULL) {
> 		stripped = talloc_array(mem_ctx, char, dst_len+1);
> 		if (stripped == NULL) {
>-			errno = ENOMEM;
>-			return false;
>+			ret = false;
>+			goto out;
> 		}
> 		if (p > name) {
> 			memcpy(stripped, name, len_before_gmt);
>@@ -636,13 +720,25 @@ static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 			memcpy(stripped + len_before_gmt, q, rest_len);
> 		}
> 		stripped[dst_len] = '\0';
>+		if (orig_name[0] != '/') {
>+			if (make_relative_path(priv->shadow_cwd,
>+					stripped) == false) {
>+				DEBUG(10, (__location__ ": path '%s' "
>+					"doesn't start with cwd '%s\n",
>+					stripped, priv->shadow_cwd));
>+				ret = false;
>+				errno = ENOENT;
>+				goto out;
>+			}
>+		}
> 		*pstripped = stripped;
> 	}
> 	*ptimestamp = timestamp;
>-	return true;
>-no_snapshot:
>-	*ptimestamp = 0;
>-	return true;
>+	ret = true;
>+
>+  out:
>+	TALLOC_FREE(abs_path);
>+	return ret;
> }
> 
> static bool shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From 16494792301b607c26c2f740797eb9ed9af9f81b Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Mon, 23 Jan 2017 10:06:44 -0800
>Subject: [PATCH 15/16] s3: VFS: shadow_copy2: Fix a memory leak in the
> connectpath function.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/modules/vfs_shadow_copy2.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index 89a73d09b0a..5c8976fffd5 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -78,6 +78,8 @@ struct shadow_copy2_private {
> 	char *shadow_cwd; /* Absolute $cwd path. */
> 	/* Absolute connectpath - can vary depending on $cwd. */
> 	char *shadow_connectpath;
>+	/* malloc'ed realpath return. */
>+	char *shadow_realpath;
> };
> 
> static int shadow_copy2_get_shadow_copy_data(
>@@ -2491,6 +2493,13 @@ static const char *shadow_copy2_connectpath(struct vfs_handle_struct *handle,
> 		goto done;
> 	}
> 
>+	/*
>+	 * SMB_VFS_NEXT_REALPATH returns a malloc'ed string.
>+	 * Don't leak memory.
>+	 */
>+	SAFE_FREE(priv->shadow_realpath);
>+	priv->shadow_realpath = result;
>+
> 	DBG_DEBUG("connect path is [%s]\n", result);
> 
> done:
>-- 
>2.11.0.483.g087da7b7c-goog
>
>
>From ab7544a9749227600b5a29544b73757cedb98a12 Mon Sep 17 00:00:00 2001
>From: Jeremy Allison <jra@samba.org>
>Date: Mon, 23 Jan 2017 10:20:13 -0800
>Subject: [PATCH 16/16] s3: VFS: shadow_copy2: Fix usage of saved_errno to only
> set errno on error.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12531
>
>Signed-off-by: Jeremy Allison <jra@samba.org>
>---
> source3/modules/vfs_shadow_copy2.c | 254 ++++++++++++++++++++++++++-----------
> 1 file changed, 182 insertions(+), 72 deletions(-)
>
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index 5c8976fffd5..a59447bb5ad 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -808,7 +808,8 @@ static char *shadow_copy2_do_convert(TALLOC_CTX *mem_ctx,
> 	char *insert = NULL;
> 	char *converted = NULL;
> 	size_t insertlen, connectlen = 0;
>-	int i, saved_errno;
>+	int saved_errno = 0;
>+	int i;
> 	size_t min_offset;
> 	struct shadow_copy2_config *config;
> 	struct shadow_copy2_private *priv;
>@@ -994,12 +995,16 @@ static char *shadow_copy2_do_convert(TALLOC_CTX *mem_ctx,
> 		errno = ENOENT;
> 	}
> fail:
>-	saved_errno = errno;
>+	if (result == NULL) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(converted);
> 	TALLOC_FREE(insert);
> 	TALLOC_FREE(slashes);
> 	TALLOC_FREE(path);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return result;
> }
> 
>@@ -1058,7 +1063,7 @@ static DIR *shadow_copy2_opendir(vfs_handle_struct *handle,
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	DIR *ret;
>-	int saved_errno;
>+	int saved_errno = 0;
> 	char *conv;
> 	struct smb_filename *conv_smb_fname = NULL;
> 
>@@ -1087,10 +1092,14 @@ static DIR *shadow_copy2_opendir(vfs_handle_struct *handle,
> 		return NULL;
> 	}
> 	ret = SMB_VFS_NEXT_OPENDIR(handle, conv_smb_fname, mask, attr);
>-	saved_errno = errno;
>+	if (ret == NULL) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
> 	TALLOC_FREE(conv_smb_fname);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -1167,7 +1176,8 @@ static int shadow_copy2_stat(vfs_handle_struct *handle,
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	char *tmp;
>-	int ret, saved_errno;
>+	int saved_errno = 0;
>+	int ret;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
> 					 smb_fname->base_name,
>@@ -1189,7 +1199,9 @@ static int shadow_copy2_stat(vfs_handle_struct *handle,
> 	}
> 
> 	ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 
> 	TALLOC_FREE(smb_fname->base_name);
> 	smb_fname->base_name = tmp;
>@@ -1197,7 +1209,9 @@ static int shadow_copy2_stat(vfs_handle_struct *handle,
> 	if (ret == 0) {
> 		convert_sbuf(handle, smb_fname->base_name, &smb_fname->st);
> 	}
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -1207,7 +1221,8 @@ static int shadow_copy2_lstat(vfs_handle_struct *handle,
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	char *tmp;
>-	int ret, saved_errno;
>+	int saved_errno = 0;
>+	int ret;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
> 					 smb_fname->base_name,
>@@ -1229,7 +1244,9 @@ static int shadow_copy2_lstat(vfs_handle_struct *handle,
> 	}
> 
> 	ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 
> 	TALLOC_FREE(smb_fname->base_name);
> 	smb_fname->base_name = tmp;
>@@ -1237,7 +1254,9 @@ static int shadow_copy2_lstat(vfs_handle_struct *handle,
> 	if (ret == 0) {
> 		convert_sbuf(handle, smb_fname->base_name, &smb_fname->st);
> 	}
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -1269,7 +1288,8 @@ static int shadow_copy2_open(vfs_handle_struct *handle,
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	char *tmp;
>-	int ret, saved_errno;
>+	int saved_errno = 0;
>+	int ret;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
> 					 smb_fname->base_name,
>@@ -1291,12 +1311,16 @@ static int shadow_copy2_open(vfs_handle_struct *handle,
> 	}
> 
> 	ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 
> 	TALLOC_FREE(smb_fname->base_name);
> 	smb_fname->base_name = tmp;
> 
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -1305,7 +1329,8 @@ static int shadow_copy2_unlink(vfs_handle_struct *handle,
> {
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
>-	int ret, saved_errno;
>+	int saved_errno = 0;
>+	int ret;
> 	struct smb_filename *conv;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
>@@ -1328,9 +1353,13 @@ static int shadow_copy2_unlink(vfs_handle_struct *handle,
> 		return -1;
> 	}
> 	ret = SMB_VFS_NEXT_UNLINK(handle, conv);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -1340,7 +1369,8 @@ static int shadow_copy2_chmod(vfs_handle_struct *handle,
> {
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
>-	int ret, saved_errno;
>+	int saved_errno = 0;
>+	int ret;
> 	char *conv = NULL;
> 	struct smb_filename *conv_smb_fname;
> 
>@@ -1372,10 +1402,14 @@ static int shadow_copy2_chmod(vfs_handle_struct *handle,
> 	}
> 
> 	ret = SMB_VFS_NEXT_CHMOD(handle, conv_smb_fname, mode);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
> 	TALLOC_FREE(conv_smb_fname);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -1386,7 +1420,8 @@ static int shadow_copy2_chown(vfs_handle_struct *handle,
> {
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
>-	int ret, saved_errno;
>+	int saved_errno = 0;
>+	int ret;
> 	char *conv = NULL;
> 	struct smb_filename *conv_smb_fname = NULL;
> 
>@@ -1416,10 +1451,14 @@ static int shadow_copy2_chown(vfs_handle_struct *handle,
> 		return -1;
> 	}
> 	ret = SMB_VFS_NEXT_CHOWN(handle, conv_smb_fname, uid, gid);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
> 	TALLOC_FREE(conv_smb_fname);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -1511,7 +1550,8 @@ static int shadow_copy2_ntimes(vfs_handle_struct *handle,
> {
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
>-	int ret, saved_errno;
>+	int saved_errno = 0;
>+	int ret;
> 	struct smb_filename *conv;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
>@@ -1534,9 +1574,13 @@ static int shadow_copy2_ntimes(vfs_handle_struct *handle,
> 		return -1;
> 	}
> 	ret = SMB_VFS_NEXT_NTIMES(handle, conv, ft);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -1545,7 +1589,8 @@ static int shadow_copy2_readlink(vfs_handle_struct *handle,
> {
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
>-	int ret, saved_errno;
>+	int saved_errno = 0;
>+	int ret;
> 	char *conv;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
>@@ -1561,9 +1606,13 @@ static int shadow_copy2_readlink(vfs_handle_struct *handle,
> 		return -1;
> 	}
> 	ret = SMB_VFS_NEXT_READLINK(handle, conv, buf, bufsiz);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -1572,7 +1621,8 @@ static int shadow_copy2_mknod(vfs_handle_struct *handle,
> {
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
>-	int ret, saved_errno;
>+	int saved_errno = 0;
>+	int ret;
> 	char *conv;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
>@@ -1588,9 +1638,13 @@ static int shadow_copy2_mknod(vfs_handle_struct *handle,
> 		return -1;
> 	}
> 	ret = SMB_VFS_NEXT_MKNOD(handle, conv, mode, dev);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -1601,7 +1655,7 @@ static char *shadow_copy2_realpath(vfs_handle_struct *handle,
> 	char *stripped = NULL;
> 	char *tmp = NULL;
> 	char *result = NULL;
>-	int saved_errno;
>+	int saved_errno = 0;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
> 					 &timestamp, &stripped)) {
>@@ -1619,10 +1673,14 @@ static char *shadow_copy2_realpath(vfs_handle_struct *handle,
> 	result = SMB_VFS_NEXT_REALPATH(handle, tmp);
> 
> done:
>-	saved_errno = errno;
>+	if (result == NULL) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(tmp);
> 	TALLOC_FREE(stripped);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return result;
> }
> 
>@@ -2113,7 +2171,8 @@ static int shadow_copy2_mkdir(vfs_handle_struct *handle,
> {
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
>-	int ret, saved_errno;
>+	int saved_errno = 0;
>+	int ret;
> 	char *conv;
> 	struct smb_filename *conv_smb_fname = NULL;
> 
>@@ -2142,10 +2201,14 @@ static int shadow_copy2_mkdir(vfs_handle_struct *handle,
> 		return -1;
> 	}
> 	ret = SMB_VFS_NEXT_MKDIR(handle, conv_smb_fname, mode);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
> 	TALLOC_FREE(conv_smb_fname);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -2154,7 +2217,8 @@ static int shadow_copy2_rmdir(vfs_handle_struct *handle,
> {
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
>-	int ret, saved_errno;
>+	int saved_errno = 0;
>+	int ret;
> 	char *conv;
> 	struct smb_filename *conv_smb_fname = NULL;
> 
>@@ -2183,10 +2247,14 @@ static int shadow_copy2_rmdir(vfs_handle_struct *handle,
> 		return -1;
> 	}
> 	ret = SMB_VFS_NEXT_RMDIR(handle, conv_smb_fname);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv_smb_fname);
> 	TALLOC_FREE(conv);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -2195,7 +2263,8 @@ static int shadow_copy2_chflags(vfs_handle_struct *handle, const char *fname,
> {
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
>-	int ret, saved_errno;
>+	int saved_errno = 0;
>+	int ret;
> 	char *conv;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
>@@ -2211,9 +2280,13 @@ static int shadow_copy2_chflags(vfs_handle_struct *handle, const char *fname,
> 		return -1;
> 	}
> 	ret = SMB_VFS_NEXT_CHFLAGS(handle, conv, flags);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -2224,7 +2297,7 @@ static ssize_t shadow_copy2_getxattr(vfs_handle_struct *handle,
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	ssize_t ret;
>-	int saved_errno;
>+	int saved_errno = 0;
> 	char *conv;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
>@@ -2241,9 +2314,13 @@ static ssize_t shadow_copy2_getxattr(vfs_handle_struct *handle,
> 		return -1;
> 	}
> 	ret = SMB_VFS_NEXT_GETXATTR(handle, conv, aname, value, size);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -2254,7 +2331,7 @@ static ssize_t shadow_copy2_listxattr(struct vfs_handle_struct *handle,
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	ssize_t ret;
>-	int saved_errno;
>+	int saved_errno = 0;
> 	char *conv;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
>@@ -2270,9 +2347,13 @@ static ssize_t shadow_copy2_listxattr(struct vfs_handle_struct *handle,
> 		return -1;
> 	}
> 	ret = SMB_VFS_NEXT_LISTXATTR(handle, conv, list, size);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -2281,7 +2362,8 @@ static int shadow_copy2_removexattr(vfs_handle_struct *handle,
> {
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
>-	int ret, saved_errno;
>+	int saved_errno = 0;
>+	int ret;
> 	char *conv;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
>@@ -2297,9 +2379,13 @@ static int shadow_copy2_removexattr(vfs_handle_struct *handle,
> 		return -1;
> 	}
> 	ret = SMB_VFS_NEXT_REMOVEXATTR(handle, conv, aname);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -2311,7 +2397,7 @@ static int shadow_copy2_setxattr(struct vfs_handle_struct *handle,
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	ssize_t ret;
>-	int saved_errno;
>+	int saved_errno = 0;
> 	char *conv;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
>@@ -2328,9 +2414,13 @@ static int shadow_copy2_setxattr(struct vfs_handle_struct *handle,
> 		return -1;
> 	}
> 	ret = SMB_VFS_NEXT_SETXATTR(handle, conv, aname, value, size, flags);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -2341,7 +2431,7 @@ static int shadow_copy2_chmod_acl(vfs_handle_struct *handle,
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	ssize_t ret;
>-	int saved_errno;
>+	int saved_errno = 0;
> 	char *conv = NULL;
> 	struct smb_filename *conv_smb_fname = NULL;
> 
>@@ -2371,10 +2461,14 @@ static int shadow_copy2_chmod_acl(vfs_handle_struct *handle,
> 		return -1;
> 	}
> 	ret = SMB_VFS_NEXT_CHMOD_ACL(handle, conv_smb_fname, mode);
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
> 	TALLOC_FREE(conv_smb_fname);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -2387,7 +2481,7 @@ static int shadow_copy2_get_real_filename(struct vfs_handle_struct *handle,
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	ssize_t ret;
>-	int saved_errno;
>+	int saved_errno = 0;
> 	char *conv;
> 
> 	DEBUG(10, ("shadow_copy2_get_real_filename called for path=[%s], "
>@@ -2414,9 +2508,13 @@ static int shadow_copy2_get_real_filename(struct vfs_handle_struct *handle,
> 	ret = SMB_VFS_NEXT_GET_REAL_FILENAME(handle, conv, name,
> 					     mem_ctx, found_name);
> 	DEBUG(10, ("NEXT_REAL_FILE_NAME returned %d\n", (int)ret));
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return ret;
> }
> 
>@@ -2428,7 +2526,7 @@ static const char *shadow_copy2_connectpath(struct vfs_handle_struct *handle,
> 	char *tmp = NULL;
> 	char *result = NULL;
> 	char *parent_dir = NULL;
>-	int saved_errno;
>+	int saved_errno = 0;
> 	size_t rootpath_len = 0;
> 	struct shadow_copy2_private *priv = NULL;
> 
>@@ -2503,11 +2601,15 @@ static const char *shadow_copy2_connectpath(struct vfs_handle_struct *handle,
> 	DBG_DEBUG("connect path is [%s]\n", result);
> 
> done:
>-	saved_errno = errno;
>+	if (result == NULL) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(tmp);
> 	TALLOC_FREE(stripped);
> 	TALLOC_FREE(parent_dir);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 	return result;
> }
> 
>@@ -2518,7 +2620,7 @@ static uint64_t shadow_copy2_disk_free(vfs_handle_struct *handle,
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	ssize_t ret;
>-	int saved_errno;
>+	int saved_errno = 0;
> 	char *conv;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, path,
>@@ -2538,9 +2640,13 @@ static uint64_t shadow_copy2_disk_free(vfs_handle_struct *handle,
> 
> 	ret = SMB_VFS_NEXT_DISK_FREE(handle, conv, bsize, dfree, dsize);
> 
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 
> 	return ret;
> }
>@@ -2552,7 +2658,7 @@ static int shadow_copy2_get_quota(vfs_handle_struct *handle, const char *path,
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	int ret;
>-	int saved_errno;
>+	int saved_errno = 0;
> 	char *conv;
> 
> 	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, path, &timestamp,
>@@ -2571,9 +2677,13 @@ static int shadow_copy2_get_quota(vfs_handle_struct *handle, const char *path,
> 
> 	ret = SMB_VFS_NEXT_GET_QUOTA(handle, conv, qtype, id, dq);
> 
>-	saved_errno = errno;
>+	if (ret == -1) {
>+		saved_errno = errno;
>+	}
> 	TALLOC_FREE(conv);
>-	errno = saved_errno;
>+	if (saved_errno != 0) {
>+		errno = saved_errno;
>+	}
> 
> 	return ret;
> }
>-- 
>2.11.0.483.g087da7b7c-goog
>

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