From 3eb882dd53d6a89da207b7be8063e5b581fd9cbf Mon Sep 17 00:00:00 2001
From: Armin Novak <armin.novak@thincast.com>
Date: Thu, 11 May 2017 13:34:37 +0200
Subject: [PATCH] Check arguments for Bitmap_SetSurface

The function may be called during connection phase
where there is no valid GDI available.
---
 libfreerdp/gdi/graphics.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/libfreerdp/gdi/graphics.c b/libfreerdp/gdi/graphics.c
index b1c1b1b47..0424a8ae3 100644
--- a/libfreerdp/gdi/graphics.c
+++ b/libfreerdp/gdi/graphics.c
@@ -183,7 +183,14 @@ static BOOL gdi_Bitmap_Decompress(rdpContext* context, rdpBitmap* bitmap,
 static BOOL gdi_Bitmap_SetSurface(rdpContext* context, rdpBitmap* bitmap,
                                   BOOL primary)
 {
-	rdpGdi* gdi = context->gdi;
+	rdpGdi* gdi;
+
+	if (!context)
+		return FALSE;
+
+	gdi = context->gdi;
+	if (!gdi)
+		return FALSE;
 
 	if (primary)
 		gdi->drawing = gdi->primary;