From 9d4ec238ee4bb7df0c4c869032320b849405052d Mon Sep 17 00:00:00 2001
From: Gregor Schneider <grschneider@gmail.com>
Date: Sat, 22 Aug 2009 18:44:17 +0000
Subject: [PATCH] Check the surface pointer before accessing it to get a handle

svn path=/trunk/; revision=42866
---
 reactos/dll/win32/gdi32/misc/gdientry.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/reactos/dll/win32/gdi32/misc/gdientry.c b/reactos/dll/win32/gdi32/misc/gdientry.c
index b5a6352f536..eb510654ecc 100644
--- a/reactos/dll/win32/gdi32/misc/gdientry.c
+++ b/reactos/dll/win32/gdi32/misc/gdientry.c
@@ -2047,15 +2047,18 @@ DdGetDxHandle(LPDDRAWI_DIRECTDRAW_LCL pDDraw,
               BOOL bRelease)
 {
     HANDLE hDD = NULL;
-    HANDLE hSurface = (HANDLE)pSurface->hDDSurface;
+    HANDLE hSurface = NULL;
 
     /* Check if we already have a surface */
     if (!pSurface)
     {
         /* We don't have one, use the DirectDraw Object handle instead */
-        hSurface = NULL;
         hDD = GetDdHandle(pDDraw->lpGbl->hDD);
-     }
+    }
+    else
+    {
+        hSurface = (HANDLE)pSurface->hDDSurface;
+    }
 
     /* Call the API */
     return (HANDLE)NtGdiDdGetDxHandle(hDD, hSurface, bRelease);