From aa2e6a8d2982e7de5e78e1a622adb670352ade61 Mon Sep 17 00:00:00 2001
From: "Roger A. Light" <roger@atchoo.org>
Date: Tue, 23 Sep 2014 00:35:51 +0100
Subject: [PATCH] Fix possible NULL derefence.

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

diff --git a/src/websockets.c b/src/websockets.c
index 6df5ae82..5c0741cc 100644
--- a/src/websockets.c
+++ b/src/websockets.c
@@ -243,7 +243,7 @@ static int callback_mqtt(struct libwebsocket_context *context,
 			break;
 
 		case LWS_CALLBACK_RECEIVE:
-			if(!u){
+			if(!u || !u->mosq){
 				return -1;
 			}
 			mosq = u->mosq;