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Q259573: BUG: SCSI Pass Through Fails with Invalid User Buffer Error

Article: Q259573
Product(s): Microsoft Windows NT
Version(s): WINDOWS:; winnt:
Operating System(s): 
Keyword(s): kbDDK kbOSWin2000bug kbStorageDev kbDSupport kbGrpDSNTDDK
Last Modified: 29-OCT-2000

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The information in this article applies to:

- Microsoft Windows 2000 Advanced Server 
- Microsoft Windows 2000 Server 
- Microsoft Windows 2000 Professional 
- Microsoft Windows 2000 Driver Development Kit (DDK) 
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SYMPTOMS
========

When you use IOCTL_SCSI_PASS_THROUGH or IOCTL_SCSI_PASS_THROUGH_DIRECT, with the
DataTransferLength member of the SCSI_PASS_THROUGH structure set to 1, the call
fails with the following error message:

  Error: 1784 The supplied user buffer is not valid for the requested
  operation.

CAUSE
=====

The Scsiport.sys driver checks the validity of the user buffer that is sent by
the application. This test fails if the value of DataTransferLength is set to 1,
and therefore the ScsiPort driver fails this call.

RESOLUTION
==========

As a temporary workaround, set DataTransferLength to a value other than 1.

STATUS
======

Microsoft has confirmed that this is a bug in the Microsoft products that are
listed at the beginning of this article.

MORE INFORMATION
================

This call fails only in Windows 2000.

REFERENCES
==========

See the Windows 2000 DDK documentation.

Additional query words: IOCTL_SCSI_PASS_THROUGH SCSI passthrough

======================================================================
Keywords          : kbDDK kbOSWin2000bug kbStorageDev kbDSupport kbGrpDSNTDDK 
Component         : DDK Drivers,IDE Drivers,SCSI
Technology        : kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000Serv kbwin2000ServSearch kbwin2000Search kbwin2000ProSearch kbwin2000Pro kbwin2000DDK kbAudDeveloper kbWinDDKSearch kbWinAdvServSearch
Version           : WINDOWS:; winnt:
Issue type        : kbbug
Solution Type     : kbpending

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