From 7be502c24730274ae7f38963f32daaa6c9a41d76 Mon Sep 17 00:00:00 2001
From: Steve Workman <sworkman@mozilla.com>
Date: Tue, 14 May 2013 16:35:18 -0700
Subject: [PATCH] Bug 870652 - Add null ptr check in
 nsDNSRecord::ReportUnusable to avoid crashing r=mcmanus

---
 netwerk/dns/nsDNSService2.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/netwerk/dns/nsDNSService2.cpp b/netwerk/dns/nsDNSService2.cpp
index 4b9ec14a128a..c919da3b5e42 100644
--- a/netwerk/dns/nsDNSService2.cpp
+++ b/netwerk/dns/nsDNSService2.cpp
@@ -231,7 +231,8 @@ nsDNSRecord::ReportUnusable(uint16_t aPort)
     // ignore the report.
 
     if (mHostRecord->addr_info &&
-        mIterGenCnt == mHostRecord->addr_info_gencnt) {
+        mIterGenCnt == mHostRecord->addr_info_gencnt &&
+        mIter) {
         mHostRecord->ReportUnusable(&mIter->mAddress);
     }