Fix segfault in winbind.

resolves: #1033595

samba-4.1.13-fix_winbind_segfault.patch

@@ -0,0 +1,82 @@
+commit 6b1091dcd9a32977542692e78cfa2c930a691404
+Author:     Jeremy Allison <jra@samba.org>
+AuthorDate: Wed Jul 16 12:41:55 2014 -0700
+Commit:     Karolin Seeger <kseeger@samba.org>
+CommitDate: Sat Sep 27 20:58:13 2014 +0200
+
+    s3: winbindd: Old NT Domain code sets struct winbind_domain->alt_name to be NULL. Ensure this is safe with modern AD-DCs.
+    
+    There are places in the code where we're not checking that alt_name is NULL
+    and then calling into the DC lookup code with a NULL name request. This can
+    happen in offline mode.
+    
+    Fixes bug #10717 - Winbind crash on losing VPN connection
+    
+    https://bugzilla.samba.org/show_bug.cgi?id=10717
+    
+    Signed-off-by: Jeremy Allison <jra@samba.org>
+    Reviewed-by: Michael Adam <obnox@samba.org>
+    
+    Autobuild-User(master): Michael Adam <obnox@samba.org>
+    Autobuild-Date(master): Mon Sep 15 23:29:00 CEST 2014 on sn-devel-104
+    
+    (cherry picked from commit 92da0b243c18546275c4736507188eba425a0732)
+---
+ source3/winbindd/winbindd_ads.c | 3 ++-
+ source3/winbindd/winbindd_cm.c  | 8 ++++++--
+ 2 files changed, 8 insertions(+), 3 deletions(-)
+
+diff --git a/source3/winbindd/winbindd_ads.c b/source3/winbindd/winbindd_ads.c
+index e47613e..fb0bc26 100644
+--- a/source3/winbindd/winbindd_ads.c
++++ b/source3/winbindd/winbindd_ads.c
+@@ -169,6 +169,7 @@ ADS_STATUS ads_idmap_cached_connection(ADS_STRUCT **adsp, const char *dom_name)
+ 	}
+ 
+ 	if (IS_DC) {
++		SMB_ASSERT(wb_dom->alt_name != NULL);
+ 		realm = SMB_STRDUP(wb_dom->alt_name);
+ 	} else {
+ 		struct winbindd_domain *our_domain = wb_dom;
+@@ -224,7 +225,7 @@ static ADS_STRUCT *ads_cached_connection(struct winbindd_domain *domain)
+ 	}
+ 
+ 	if ( IS_DC ) {
+-
++		SMB_ASSERT(domain->alt_name != NULL);
+ 		realm = SMB_STRDUP(domain->alt_name);
+ 	}
+ 	else {
+diff --git a/source3/winbindd/winbindd_cm.c b/source3/winbindd/winbindd_cm.c
+index 61917db..8bbc886 100644
+--- a/source3/winbindd/winbindd_cm.c
++++ b/source3/winbindd/winbindd_cm.c
+@@ -833,6 +833,10 @@ static NTSTATUS get_trust_creds(const struct winbindd_domain *domain,
+ 			return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;			
+ 		}
+ 
++		if (our_domain->alt_name == NULL) {
++			return NT_STATUS_INVALID_PARAMETER;
++		}
++
+ 		if (asprintf(machine_krb5_principal, "%s$@%s",
+ 			     account_name, our_domain->alt_name) == -1)
+ 		{
+@@ -1199,7 +1203,7 @@ static bool dcip_to_name(TALLOC_CTX *mem_ctx,
+ 	/* For active directory servers, try to get the ldap server name.
+ 	   None of these failures should be considered critical for now */
+ 
+-	if (lp_security() == SEC_ADS) {
++	if ((lp_security() == SEC_ADS) && (domain->alt_name != NULL)) {
+ 		ADS_STRUCT *ads;
+ 		ADS_STATUS ads_status;
+ 		char addr[INET6_ADDRSTRLEN];
+@@ -1327,7 +1331,7 @@ static bool get_dcs(TALLOC_CTX *mem_ctx, struct winbindd_domain *domain,
+ 		return True;
+ 	}
+ 
+-	if (sec == SEC_ADS) {
++	if ((sec == SEC_ADS) && (domain->alt_name != NULL)) {
+ 		char *sitename = NULL;
+ 
+ 		/* We need to make sure we know the local site before

samba.spec

@@ -6,7 +6,7 @@
 # ctdb is enabled by default, you can disable it with: --without clustering
 %bcond_without clustering
 
-%define main_release 1
+%define main_release 5
 
 %define samba_version 4.1.12
 %define talloc_version 2.0.8
@@ -94,6 +94,8 @@ Source6: samba.pamd
 Source200: README.dc
 Source201: README.downgrade
 
+Patch0:    samba-4.1.13-fix_winbind_segfault.patch
+
 BuildRoot:      %(mktemp -ud %{_tmppath}/%{name}-%{version}-%{release}-XXXXXX)
 
 Requires(pre): /usr/sbin/groupadd
@@ -513,6 +515,8 @@ module necessary to communicate to the Winbind Daemon
 %prep
 %setup -q -n samba-%{version}%{pre_release}
 
+%patch0 -p1 -b .samba-4.1.13-fix_winbind_segfault.patch
+
 %build
 %global _talloc_lib ,talloc,pytalloc,pytalloc-util
 %global _tevent_lib ,tevent,pytevent
@@ -1583,6 +1587,9 @@ rm -rf %{buildroot}
 %{_mandir}/man8/pam_winbind.8*
 
 %changelog
+* Tue Oct 07 2014 - Andreas Schneider <asn@redhat.com> - 4.1.12-5
+- resolves: #1033595 - Fix segfault in winbind.
+
 * Wed Sep 24 2014 - Andreas Schneider <asn@redhat.com> - 4.1.12-1
 - Update to Samba 4.1.12.