From 249b2d049b5718847c53b76ac807fe2500d75b1d Mon Sep 17 00:00:00 2001
From: Andy Green <andy@warmcat.com>
Date: Wed, 4 Jan 2017 14:38:39 +0800
Subject: [PATCH] client: protect against possible NULL deref path
---
lib/libwebsockets.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/lib/libwebsockets.c b/lib/libwebsockets.c
index 5ab49a12..dc4aa5f4 100755
--- a/lib/libwebsockets.c
+++ b/lib/libwebsockets.c
@@ -408,7 +408,9 @@ just_kill_connection:
char* errorString;
lwsl_debug("Connection closed before server reply\n");
- errorString = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP);
+ errorString = NULL;
+ if (wsi->u.hdr.ah)
+ errorString = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP);
if (errorString) {
context->protocols[0].callback(wsi,
LWS_CALLBACK_CLIENT_CONNECTION_ERROR,
--
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