From aa67fe7a8cd2b8bf1b0ee8f3e4c5513f03f25ebd Mon Sep 17 00:00:00 2001
From: Simon Kelley <simon@thekelleys.org.uk>
Date: Mon, 4 Feb 2013 21:32:34 +0000
Subject: [PATCH] Catch NULL pointer deref if qdcount == 0

---
 src/auth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/auth.c b/src/auth.c
index a860780..6ad1ecd 100644
--- a/src/auth.c
+++ b/src/auth.c
@@ -470,7 +470,7 @@ size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t n
     }
   
   /* Add auth section */
-  if (auth)
+  if (auth && zone)
     {
       char *authname;
       int newoffset, offset = 0;