From f4a430511eaad888164c163ccaa85b52f3db5cb7 Mon Sep 17 00:00:00 2001
From: Hartmut Birr <osexpert@googlemail.com>
Date: Mon, 4 Apr 2005 23:11:19 +0000
Subject: [PATCH] Check for an valid mdl pointer before calling IoFreeMdl in
 IoReadWriteCompletion.

svn path=/trunk/; revision=14493
---
 reactos/ntoskrnl/io/cleanup.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/reactos/ntoskrnl/io/cleanup.c b/reactos/ntoskrnl/io/cleanup.c
index b543e5c463d..ef2097c0dc5 100644
--- a/reactos/ntoskrnl/io/cleanup.c
+++ b/reactos/ntoskrnl/io/cleanup.c
@@ -1,4 +1,4 @@
-/* $Id:$
+/* $Id$
  * 
  * COPYRIGHT:       See COPYING in the top level directory
  * PROJECT:         ReactOS kernel
@@ -109,7 +109,10 @@ VOID IoReadWriteCompletion(PDEVICE_OBJECT DeviceObject,
 
    if (DeviceObject->Flags & DO_DIRECT_IO)
    {
-      IoFreeMdl(Irp->MdlAddress);
+      if (Irp->MdlAddress)
+      {
+         IoFreeMdl(Irp->MdlAddress);
+      }
    }
 }