From 1c34e774eff6c5a22501833444a10440cf3f915a Mon Sep 17 00:00:00 2001
From: Jon TURNEY <jon.turney@dronecode.org.uk>
Date: Mon, 11 Nov 2013 15:09:18 +0000
Subject: [PATCH] hw/xwin: Fix a potential crash in winRedrawScreenShadowDDNL()

Seen during shutdown when using '-fullscreen' and '-depth 8'

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Colin Harrison <colin.harrison@virgin.net>
---
 hw/xwin/winshadddnl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/xwin/winshadddnl.c b/hw/xwin/winshadddnl.c
index 55af5c383..cb326dc81 100644
--- a/hw/xwin/winshadddnl.c
+++ b/hw/xwin/winshadddnl.c
@@ -986,6 +986,10 @@ winRedrawScreenShadowDDNL(ScreenPtr pScreen)
     RECT rcSrc, rcDest;
     POINT ptOrigin;
 
+    /* Return immediately if we didn't get needed surfaces */
+    if (!pScreenPriv->pddsPrimary4 || !pScreenPriv->pddsShadow4)
+        return;
+
     /* Get the origin of the window in the screen coords */
     ptOrigin.x = pScreenInfo->dwXOffset;
     ptOrigin.y = pScreenInfo->dwYOffset;