From b75680a15fb7343c2f2db58a5427785a788dce5e Mon Sep 17 00:00:00 2001
From: Andy Green <andy@warmcat.com>
Date: Mon, 12 Dec 2016 20:39:03 +0800
Subject: [PATCH] client: avoid possible NULL deref on error path

https://github.com/warmcat/libwebsockets/issues/672
---
 lib/client-handshake.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/client-handshake.c b/lib/client-handshake.c
index 57a9343f..ca238a1f 100644
--- a/lib/client-handshake.c
+++ b/lib/client-handshake.c
@@ -295,8 +295,9 @@ lws_client_connect_2(struct lws *wsi)
 
 oom4:
 	/* we're closing, losing some rx is OK */
-	wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
-	//lwsl_err("%d\n", wsi->mode);
+	if (wsi->u.hdr.ah)
+		wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
+
 	if (wsi->mode == LWSCM_HTTP_CLIENT)
 		wsi->vhost->protocols[0].callback(wsi,
 			LWS_CALLBACK_CLIENT_CONNECTION_ERROR,