From 56c687b39b7e491bf31a93a3061d7ee6299c492e Mon Sep 17 00:00:00 2001
From: Alexander Alashkin <alexander.alashkin@cesanta.com>
Date: Tue, 19 Apr 2016 09:17:32 +0100
Subject: [PATCH] Check for null in DNS handler

PUBLISHED_FROM=e8b719d491688032e6395b75d5859ffad7d7ea23
---
 mongoose.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mongoose.c b/mongoose.c
index 859c30ff..8f95fbca 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -9357,10 +9357,14 @@ static void mg_resolve_async_eh(struct mg_connection *nc, int ev, void *data) {
   struct mg_resolve_async_request *req;
   struct mg_dns_message *msg;
 
-  DBG(("ev=%d", ev));
+  DBG(("ev=%d user_data=%p", ev, nc->user_data));
 
   req = (struct mg_resolve_async_request *) nc->user_data;
 
+  if (req == NULL) {
+    return;
+  }
+
   switch (ev) {
     case MG_EV_CONNECT:
     case MG_EV_POLL: