Microsoft KB Archive/923880

= FIX: When a driver calls the WZCQueryInterface function, heap corruption may occur, and a Windows CE .NET 4.2 device may stop responding =

Article ID: 923880

Article Last Modified on 9/11/2007

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APPLIES TO


 * Microsoft Windows CE .NET 4.2

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SYMPTOMS
Consider the following scenario. A Microsoft Windows CE .NET 4.2 driver calls the Wireless Zero Config API WZCQueryInterface function. The WZCQueryInterface function returns an error code. In this scenario, heap corruption may occur. Therefore, the Windows CE .NET 4.2-based device may stop responding. Depending on the driver, you may experience this problem after you repeatedly suspend and then resume the Windows CE .NET 4.2-based device.



CAUSE
This problem occurs because the WZCQueryInterface function has an error path that frees a heap allocation pointer two times. In a high-interrupt or thread-switch environment, another thread may allocate a heap item at the same memory address. Therefore, heap corruption occurs.



Software update information
A supported software update is now available from Microsoft as Windows CE .NET 4.2 Platform Builder Monthly Update (September 2006). You can confirm this by scrolling to the &quot;File information&quot; section of this article. The package file name contains the product version, date, Knowledge Base article number, and processor type. The package file name format is:

Product version-yymmdd-kbnnnnnn-processor type

For example: Wincepb50-060503-kb917590-armv4i.msi is the ARMV4i Windows CE 5.0 Platform Builder fix that is documented in KB article 917590 and that is contained in the May 2006 monthly update. To resolve this problem immediately, click the following article number for information about obtaining Windows CE Platform Builder and core operating system software updates:

837392 How to locate core operating system fixes for Microsoft Windows CE Platform Builder products

Prerequisites
This software update is supported only if all previously issued software updates for this product have also been applied.

Restart requirement
After you apply this software update, you must perform a clean build of the whole platform. To clean the platform, click Clean on the Build menu. To build the platform, click Build Platform on the Build menu. You do not have to restart the computer after you apply this software update.

Update replacement information
This software update does not replace any other software updates.

File information
The English version of this software update package has the file attributes, or the later file attributes, that are listed in the following table.

The English version of this software update 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.



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 about the WZCQueryInterface function, visit the following Microsoft Developer Network (MSDN) Web site:

http://msdn2.microsoft.com/en-us/library/ms896672.aspx

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

Keywords: kbhotfixserver kbpubtypekc kbqfe kbfix kbbug KB923880

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