From a3461cef0690dff3da3560b2d794b7dfd75babb3 Mon Sep 17 00:00:00 2001
From: Vic Lee <llyzs.vic@gmail.com>
Date: Fri, 30 May 2014 23:34:04 +0800
Subject: [PATCH] transport: add a null pointer check.

---
 libfreerdp/core/transport.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libfreerdp/core/transport.c b/libfreerdp/core/transport.c
index bb455a927..ffedf1b63 100644
--- a/libfreerdp/core/transport.c
+++ b/libfreerdp/core/transport.c
@@ -711,7 +711,7 @@ int transport_read_layer(rdpTransport* transport, BYTE* data, int bytes)
 
 		if (status < 0)
 		{
-			if (!BIO_should_retry(transport->frontBio))
+			if (!transport->frontBio || !BIO_should_retry(transport->frontBio))
 			{
 				/* something unexpected happened, let's close */
 				transport->layer = TRANSPORT_LAYER_CLOSED;