From e9e0764acef96c7c8bba14a0252c497da3f54af0 Mon Sep 17 00:00:00 2001
From: Martin Haimberger <martin.haimberger@thincast.com>
Date: Mon, 22 Aug 2016 02:17:11 -0700
Subject: [PATCH] libfreerdp/core: transport_write unchecked parameters

transport_write did not check if transport or bio are
set. The transport read checks it. In using fastpath
and for example a mouse input is sent, the transport
is never checked and can cause a segfault.
---
 libfreerdp/core/transport.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/libfreerdp/core/transport.c b/libfreerdp/core/transport.c
index 26563e779..2ae619add 100644
--- a/libfreerdp/core/transport.c
+++ b/libfreerdp/core/transport.c
@@ -657,6 +657,15 @@ int transport_write(rdpTransport* transport, wStream* s)
 	int status = -1;
 	int writtenlength = 0;
 
+	if (!transport)
+		return -1;
+
+	if (!transport->frontBio)
+	{
+		transport->layer = TRANSPORT_LAYER_CLOSED;
+		return -1;
+	}
+
 	EnterCriticalSection(&(transport->WriteLock));
 
 	length = Stream_GetPosition(s);