From c44ac169e6dcee32c6721ffe5d8182a3d0334d78 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?G=C3=A9=20van=20Geldorp?= <ge@gse.nl>
Date: Wed, 7 Apr 2004 08:25:40 +0000
Subject: [PATCH] There can never be a parent/child relationship between
 windows if one of them is invalid. Fixes bug #217.

svn path=/trunk/; revision=8998
---
 reactos/lib/user32/windows/window.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/reactos/lib/user32/windows/window.c b/reactos/lib/user32/windows/window.c
index 72bb81d0419..f2a60f70690 100644
--- a/reactos/lib/user32/windows/window.c
+++ b/reactos/lib/user32/windows/window.c
@@ -1,4 +1,4 @@
-/* $Id: window.c,v 1.105 2004/04/02 23:54:26 weiden Exp $
+/* $Id: window.c,v 1.106 2004/04/07 08:25:40 gvg Exp $
  *
  * COPYRIGHT:       See COPYING in the top level directory
  * PROJECT:         ReactOS user32.dll
@@ -1018,6 +1018,11 @@ BOOL STDCALL
 IsChild(HWND hWndParent,
 	HWND hWnd)
 {
+   if (! IsWindow(hWndParent) || ! IsWindow(hWnd))
+   {
+       return FALSE;
+   }
+
    do 
    {
       hWnd = (HWND)NtUserGetWindowLong(hWnd, GWL_HWNDPARENT, FALSE);