Microsoft KB Archive/933607

= UMDF User-mode drivers that use the Windows SideShow class extension return errors when you process commands asynchronously =

Article ID: 933607

Article Last Modified on 8/29/2007

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APPLIES TO


 * Windows Vista Ultimate
 * Windows Vista Ultimate 64-bit Edition
 * Windows Vista Business
 * Windows Vista Business 64-bit Edition
 * Windows Vista Home Premium
 * Windows Vista Home Premium 64-bit Edition
 * Windows Vista Enterprise
 * Windows Vista Enterprise 64-bit Edition

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SYMPTOMS
When a User-Mode Driver Framework (UMDF) driver that uses the Windows SideShow class extension processes a command asynchronously, the class extension may return a false error without fully processing the command. This problem may occur when the incoming input/output control (IOCTL) is not passed to the class extension component immediately. This problem may also occur when the IOCTL is from a sequential queue.



CAUSE
This problem occurs if the developer’s driver impersonates outside the scope of the original OnXxx callback. When this happens, the impersonation fails. This failure can cause the driver to return an incorrect error. To correctly handle incoming IOCTLs, the SideShow class extension component requires successful use of impersonation.



Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
No prerequisites are required.

Restart requirement
You do not have to restart your computer after you apply this hotfix.

Hotfix replacement Information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Vista, 64-bit versions


STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: Vista SideShow Gadget UMDF AuxiliaryDisplayEnhancedDriver.dll

Keywords: kbbug kbfix kbqfe kbpubtypekc kbhotfixserver kbwinvistapostrtmfix KB933607

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