From f2c39d4869da56268726f6e8fc224de8cecb7336 Mon Sep 17 00:00:00 2001
From: Jakub Hrozek <jhrozek@redhat.com>
Date: Oct 15 2012 15:59:11 +0000
Subject: LDAP: Check validity of naming_context


https://fedorahosted.org/sssd/ticket/1581

If the namingContext attribute had no values or multiple values, then
our code would dereference a NULL pointer.

---

diff --git a/src/providers/ldap/sdap.c b/src/providers/ldap/sdap.c
index cdc8b1f..f5b1f95 100644
--- a/src/providers/ldap/sdap.c
+++ b/src/providers/ldap/sdap.c
@@ -746,7 +746,7 @@ static char *get_naming_context(TALLOC_CTX *mem_ctx,
      * a zero-length namingContexts value in some situations. In this
      * case, we should return it as NULL so things fail gracefully.
      */
-    if (naming_context[0] == '\0') {
+    if (naming_context && naming_context[0] == '\0') {
         talloc_zfree(naming_context);
     }