[jimtabor] 64054: [Win32k] - Apply band-aid patch from CORE-8506. Problem still persists, how did a bad region get plugged into the DCE structure?

Author: jimtabor
Date: Sat Sep  6 17:47:45 2014
New Revision: 64054

URL: http://svn.reactos.org/svn/reactos?rev=64054&view=rev
Log:
[Win32k]
- Apply band-aid patch from CORE-8506. Problem still persists, how did a bad region get plugged into the DCE structure?

Modified:
    trunk/reactos/win32ss/user/ntuser/windc.c

Modified: trunk/reactos/win32ss/user/ntuser/windc.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/win32ss/user/ntuser/windc.c...
==============================================================================
--- trunk/reactos/win32ss/user/ntuser/windc.c	[iso-8859-1] (original)
+++ trunk/reactos/win32ss/user/ntuser/windc.c	[iso-8859-1] Sat Sep  6 17:47:45 2014
@@ -215,7 +215,7 @@
       PWND Parent;

Parent = Window->spwndParent;
-      if(!Parent)
+      if (!Parent)
       {
          RgnVisible = NULL;
          goto noparent;
@@ -252,15 +252,19 @@
 noparent:
    if (Flags & DCX_INTERSECTRGN)
    {
-      if(Dce->hrgnClip != NULL)
-      {
-         PREGION RgnClip = REGION_LockRgn(Dce->hrgnClip);
+      PREGION RgnClip = NULL;
+
+      if (Dce->hrgnClip != NULL)
+          RgnClip = REGION_LockRgn(Dce->hrgnClip);
+      
+      if (RgnClip)
+      {
          IntGdiCombineRgn(RgnVisible, RgnVisible, RgnClip, RGN_AND);
          REGION_UnlockRgn(RgnClip);
       }
       else
       {
-         if(RgnVisible != NULL)
+         if (RgnVisible != NULL)
          {
             REGION_Delete(RgnVisible);
          }