Microsoft KB Archive/917022

= A program that uses the Performance Data Helper library to open a performance object may stop responding on a Windows XP-based computer =

Article ID: 917022

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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SYMPTOMS
Microsoft Windows XP limits the combined length of the counter names of a performance object. The effective limit is a maximum size of 8 KB of characters. When you surpass this limit, a heap corruption occurs when a program uses the Performance Data Helper (PDH) library to open a performance object. For example, a heap corruption occurs when the Perfmon.exe utility or a third-party performance monitoring program opens a performance object. Additionally, the heap corruption causes the program to stop responding.



CAUSE
This problem occurs because of an incorrect check to determine whether a PDH buffer size must be increased to hold more data.



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
To install this hotfix, you must have Windows XP Service Pack 2 (SP2) installed on your computer.

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.



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 terminology that is used in this article, 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: PDH PdhiEnumObjectItems PdhEnumObjectItems

Keywords: kbqfe kbhotfixserver kbwinxpsp3fix kbwinxppresp3fix kbfix kbbug kbpubtypekc KB917022

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