Description: Checks for null value before doing a strcasecmp, fixes LP #1003296
 The function _pam_winbind_change_pwd crashes
 due to a null value passed to the function strcasecmp and
 denies to login via graphical login manager.
 .
 samba (2:3.6.3-2ubuntu2.3) precise-proposed; urgency=low
 .
   * nsswitch/pam_winbind.c: checks for a null value before strcasecmp, that causes
	_pam_winbind_change_pwd to crash
     (LP: #1003296).
Author: Luca Lorenzetto <lorenzetto-luca@ubuntu-it.org>
Bug-Ubuntu: https://bugs.launchpad.net/bugs/1003296

---
Bug: https://bugzilla.samba.org/show_bug.cgi?id=9013
Bug-Ubuntu: https://launchpad.net/bugs/1003296
Forwarded: no
Last-Update: 2012-09-11

--- samba-3.6.3.orig/nsswitch/pam_winbind.c
+++ samba-3.6.3/nsswitch/pam_winbind.c
@@ -831,7 +831,7 @@ static bool _pam_winbind_change_pwd(stru
 	}
 	_pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
 
-	if (strcasecmp(resp->resp, "yes") == 0) {
+	if ((resp->resp != NULL) && (strcasecmp(resp->resp, "yes") == 0)) {
 		retval = true;
 	}