From e6b91f9ede34d5ce91ff6873a46299d110b7b353 Mon Sep 17 00:00:00 2001
From: Stefan Ginsberg <stefanginsberg@gmail.com>
Date: Wed, 27 May 2009 16:39:24 +0000
Subject: [PATCH] - IntEmptyClipboardData: Check before freeing a potential
 null pointer

svn path=/trunk/; revision=41143
---
 reactos/subsystems/win32/win32k/ntuser/clipboard.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/reactos/subsystems/win32/win32k/ntuser/clipboard.c b/reactos/subsystems/win32/win32k/ntuser/clipboard.c
index 49635f75601..a5dbb06a6d9 100644
--- a/reactos/subsystems/win32/win32k/ntuser/clipboard.c
+++ b/reactos/subsystems/win32/win32k/ntuser/clipboard.c
@@ -229,7 +229,10 @@ IntEmptyClipboardData()
     while(ce)
     {
         tmp = ce->next;
-        ExFreePool(ce->hData);
+		if (ce->hData)
+		{
+            ExFreePool(ce->hData);
+        }
 	    ExFreePool(ce);
 	    ce = tmp;
     }