[navaraf] 16748: Add check for global handles to NtGdiDeleteDC, this prevents applications from destroying DCs that are part of DCEs.

Add check for global handles to NtGdiDeleteDC, this prevents
applications from destroying DCs that are part of DCEs.
Modified: trunk/reactos/subsys/win32k/objects/dc.c
  _____  

Modified: trunk/reactos/subsys/win32k/objects/dc.c
--- trunk/reactos/subsys/win32k/objects/dc.c	2005-07-26 15:47:26 UTC
(rev 16747)
+++ trunk/reactos/subsys/win32k/objects/dc.c	2005-07-26 16:03:46 UTC
(rev 16748)
@@ -962,10 +962,17 @@

 {
   PDC  DCToDelete;
 
+  if (!GDIOBJ_OwnedByCurrentProcess(DCHandle))
+    {
+      SetLastWin32Error(ERROR_INVALID_HANDLE);
+      return FALSE;
+    }
+  
   DCToDelete = DC_LockDc(DCHandle);
   if (DCToDelete == NULL)
     {
-      return  FALSE;
+      SetLastWin32Error(ERROR_INVALID_HANDLE);
+      return FALSE;
     }
 
   /*  First delete all saved DCs  */