[ros-dev] NTOSKRNL bugcheck when clicking on "My Computer C disk icon"

[Hartmut Birr]

Gge wrote:

> With svn 14668 , Ros bugchecks when I click on the "my computer " icon
> and o then on the "C" disk drive icon as per debug messages below.
> This is a regression and it is always reproductible .
> I cannot say exactly when it has been broken.
> Any idea ?

It may be a result of my changes in 14418. The mdl is only allocated if
the read/write length is greater 0. Can you add my patch and try it again?

- Hartmut


-------------- next part --------------
Index: drivers/fs/vfat/rw.c
===================================================================
--- drivers/fs/vfat/rw.c	(revision 14480)
+++ drivers/fs/vfat/rw.c	(working copy)
@@ -617,6 +617,7 @@
    }
    if (Length == 0)
    {
+      DPRINT1("Length is 0\n");
       IrpContext->Irp->IoStatus.Information = 0;
       Status = STATUS_SUCCESS;
       goto ByeBye;
Index: ntoskrnl/io/cleanup.c
===================================================================
--- ntoskrnl/io/cleanup.c	(revision 14480)
+++ ntoskrnl/io/cleanup.c	(working copy)
@@ -1,4 +1,4 @@
-/* $Id:$
+/* $Id$
  * 
  * COPYRIGHT:       See COPYING in the top level directory
  * PROJECT:         ReactOS kernel
@@ -109,7 +109,10 @@
 
    if (DeviceObject->Flags & DO_DIRECT_IO)
    {
-      IoFreeMdl(Irp->MdlAddress);
+      if (Irp->MdlAddress)
+      {
+         IoFreeMdl(Irp->MdlAddress);
+      }
    }
 }