s3: Protect tldap_errstr against a NULL ld

diff --git a/source3/lib/tldap_util.c b/source3/lib/tldap_util.c
index b83a1b75f0248435d7eac843538d746baf953632..8f7ad883ef131d3a3e9098bebd401f90875591cc 100644 (file)
--- a/source3/lib/tldap_util.c
+++ b/source3/lib/tldap_util.c
@@ -337,7 +337,9 @@ const char *tldap_errstr(TALLOC_CTX *mem_ctx, struct tldap_context *ld, int rc)
        const char *ld_error = NULL;
        char *res;
 
-       ld_error = tldap_msg_diagnosticmessage(tldap_ctx_lastmsg(ld));
+       if (ld != NULL) {
+               ld_error = tldap_msg_diagnosticmessage(tldap_ctx_lastmsg(ld));
+       }
        res = talloc_asprintf(mem_ctx, "LDAP error %d (%s), %s", rc,
                              tldap_err2string(rc),
                              ld_error ? ld_error : "unknown");