check parameter in GetWindowInfo()

reactos/subsys/win32k/ntuser

diff -u -r1.56 -r1.57
--- misc.c	2 Apr 2004 20:51:08 -0000	1.56
+++ misc.c	2 Apr 2004 21:03:25 -0000	1.57
@@ -1,4 +1,4 @@

-/* $Id: misc.c,v 1.56 2004/04/02 20:51:08 weiden Exp $

+/* $Id: misc.c,v 1.57 2004/04/02 21:03:25 weiden Exp $

  *
  * COPYRIGHT:        See COPYING in the top level directory
  * PROJECT:          ReactOS kernel

@@ -389,6 +389,13 @@

         return FALSE;
       }
       

+      if(wi.cbSize != sizeof(WINDOWINFO))
+      {
+        IntReleaseWindowObject(WindowObject);
+        SetLastWin32Error(ERROR_INVALID_PARAMETER);
+        return FALSE;
+      }
+      

       if((Ret = (DWORD)IntGetWindowInfo(WindowObject, &wi)))
       {
         Status = MmCopyToCaller((PVOID)Param2, &wi, sizeof(WINDOWINFO));