The Universal Disk Format (UDF) component may incorrectly set the IoStatus.Information field on a Windows Vista-based computer

On a Windows Vista-based computer, the Universal Disk Format (UDF) component may set the Irp->IoStatus.Information field to a size beyond of the End of File (EOF) flag of a file when a paging read IRP is completed. Therefore, file-system filter drivers that depend on the result of the Irp->IoStatus.Information field run incorrectly.

Notes

• This problem rarely occurs.
• The expected behavior is described in the "More information" section.

Hotfix information

A supported hotfix is 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 software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

There are no prerequisites for installing this hotfix.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

Registry information

To use one of the hotfixes in this package, you do not have to make any changes to the registry.

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, x86-based versions

Windows Vista, x64-based versions

Windows Vista, IA64-based versions

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

If a paging read I/O request packet is completed, the number of bytes that are read is returned in the information member of the IO_STATUS_BLOCK structure to which the Irp->IoStatus pointer points.

For more information about the read IRP, visit the following Microsoft Web sites:For more information about UDFS, visit the following Microsoft Web site: For more information, click the following article number to view the article in the Microsoft Knowledge Base: