--- samba4-4.0.0~alpha17~git201110100928/source4/librpc/rpc/dcerpc_smb.c.orig	2012-02-18 15:23:58.000000000 +0100
+++ samba4-4.0.0~alpha17~git201110100928/source4/librpc/rpc/dcerpc_smb.c	2012-02-18 15:43:03.000000000 +0100
@@ -41,7 +41,12 @@
 */
 static void pipe_dead(struct dcecli_connection *c, NTSTATUS status)
 {
-	struct smb_private *smb = (struct smb_private *)c->transport.private_data;
+	struct smb_private *smb = talloc_get_type(c->transport.private_data, struct smb_private);
+	if (smb == NULL) {
+		DEBUG(4,("pipe_dead: transport private smb information NULL after %s\n",
+			nt_errstr(status)));
+		return;
+	}
 
 	if (smb->dead) {
 		return;