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The EnumPrinterDataEx function causes pool corruption in the printer spooler service in Windows 7 or in Windows Server 2008 R2

Not sure if this is the right fix? We've added this issue to our memory dump diagnostic which can confirm.
Symptoms
Consider the following scenario:
  • You have a computer that is running Windows Server 2008 R2 or Windows 7.
  • An application or service calls the EnumPrinterDataEx function to enumerate printer data.
  • Another application or service changes the same printer data at the same time.
In this scenario, the EnumPrinterDataEx function may cause pool corruption in the printer spooler service. The printer spooler service crashes if the corrupted pool is accessed some time later.
Cause
This issue occurs because of a race condition.

When you call the EnumPrinterDataEx function to enumerate printer data, you must call the function two times. The first function call is used to receive the required buffer size and the second function call is used to receive the data. If the printer data that is enumerated is changed between the two function calls, the EnumPrinterDataEx function may overwrite buffer size and cause pool corruption.
Resolution

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 the problem described in this article. 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 website: 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

To apply this hotfix, you must be running one of the following operating systems:
  • Windows 7
  • Windows 7 Service Pack 1 (SP1)
  • Windows Server 2008 R2
  • Windows Server 2008 R2 Service Pack 1 (SP1)
For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

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

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
    VersionProductMilestoneService branch
    6.1.760 0.16xxxWindows 7 and Windows Server 2008 R2RTMGDR
    6.1.760 0.20xxxWindows 7 and Windows Server 2008 R2RTMLDR
    6.1.760 1.17xxxWindows 7 and Windows Server 2008 R2SP1GDR
    6.1.760 1.21xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 7
File nameFile versionFile sizeDateTimePlatform
Localspl.dll6.1.7600.20970768,51220-May-201112:08x86
Localspl.dll6.1.7601.21731769,02420-May-201115:24x86
Winprint.dll6.1.7601.1751430,20820-Nov-201012:21x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Localspl.dll6.1.7600.20970955,90420-May-201112:49x64
Localspl.dll6.1.7601.21731956,41620-May-201115:27x64
Winprint.dll6.1.7601.1751439,42420-Nov-201013:27x64
Localspl.dll6.1.7600.20970768,51220-May-201112:08x86
Localspl.dll6.1.7601.21731769,02420-May-201115:24x86
Winprint.dll6.1.7601.1751430,20820-Nov-201012:21x86
For all supported IA-64-based versions of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Localspl.dll6.1.7600.209702,053,63220-May-201111:41IA-64
Localspl.dll6.1.7601.217312,054,65620-May-201115:12IA-64
Winprint.dll6.1.7601.1751490,62420-Nov-201010:28IA-64
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
For more information about the EnumPrinterDataEx function, visit the following Microsoft website:For more information about software update terminology, 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 file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7
File nameX86_17a99ddbcb04aaa82d379fabae882221_31bf3856ad364e35_6.1.7600.20970_none_47deb9c76c3cbc67.manifest
File versionNot applicable
File size718
Date (UTC)20-May-2011
Time (UTC)23:33
PlatformNot applicable
File nameX86_d9b7b6adb2d5c304f77b7bcabdd32aa6_31bf3856ad364e35_6.1.7601.21731_none_5c7680120a361514.manifest
File versionNot applicable
File size718
Date (UTC)20-May-2011
Time (UTC)23:33
PlatformNot applicable
File nameX86_microsoft-windows-p..ooler-core-localspl_31bf3856ad364e35_6.1.7600.20970_none_308128e20d1ba535.manifest
File versionNot applicable
File size4,844
Date (UTC)20-May-2011
Time (UTC)23:36
PlatformNot applicable
File nameX86_microsoft-windows-p..ooler-core-localspl_31bf3856ad364e35_6.1.7601.21731_none_3293c5e20a20bab4.manifest
File versionNot applicable
File size4,844
Date (UTC)20-May-2011
Time (UTC)23:36
PlatformNot applicable
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameAmd64_17a99ddbcb04aaa82d379fabae882221_31bf3856ad364e35_6.1.7600.20970_none_a3fd554b249a2d9d.manifest
File versionNot applicable
File size720
Date (UTC)20-May-2011
Time (UTC)23:34
PlatformNot applicable
File nameAmd64_6ca8bfe94145d110d9d46c736034279c_31bf3856ad364e35_6.1.7601.21731_none_a5eed0d592fa3c64.manifest
File versionNot applicable
File size722
Date (UTC)20-May-2011
Time (UTC)23:34
PlatformNot applicable
File nameAmd64_c2cb90367c48ddfac821acd93fb5ca93_31bf3856ad364e35_6.1.7600.20970_none_0dd153f72d04a897.manifest
File versionNot applicable
File size722
Date (UTC)20-May-2011
Time (UTC)23:34
PlatformNot applicable
File nameAmd64_d9b7b6adb2d5c304f77b7bcabdd32aa6_31bf3856ad364e35_6.1.7601.21731_none_b8951b95c293864a.manifest
File versionNot applicable
File size720
Date (UTC)20-May-2011
Time (UTC)23:34
PlatformNot applicable
File nameAmd64_microsoft-windows-p..ooler-core-localspl_31bf3856ad364e35_6.1.7600.20970_none_8c9fc465c579166b.manifest
File versionNot applicable
File size4,845
Date (UTC)20-May-2011
Time (UTC)23:38
PlatformNot applicable
File nameAmd64_microsoft-windows-p..ooler-core-localspl_31bf3856ad364e35_6.1.7601.21731_none_8eb26165c27e2bea.manifest
File versionNot applicable
File size4,845
Date (UTC)20-May-2011
Time (UTC)23:38
PlatformNot applicable
File nameX86_microsoft-windows-p..ooler-core-localspl_31bf3856ad364e35_6.1.7600.20970_none_308128e20d1ba535.manifest
File versionNot applicable
File size4,844
Date (UTC)20-May-2011
Time (UTC)23:38
PlatformNot applicable
File nameX86_microsoft-windows-p..ooler-core-localspl_31bf3856ad364e35_6.1.7601.21731_none_3293c5e20a20bab4.manifest
File versionNot applicable
File size4,844
Date (UTC)20-May-2011
Time (UTC)23:38
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
File nameIa64_2b2162024de84598f2f007d11842e48d_31bf3856ad364e35_6.1.7601.21731_none_5fac7be8523b3e20.manifest
File versionNot applicable
File size720
Date (UTC)20-May-2011
Time (UTC)23:33
PlatformNot applicable
File nameIa64_39b67d86096c89761d787b65c8adba19_31bf3856ad364e35_6.1.7600.20970_none_b3f47b76d1f95d69.manifest
File versionNot applicable
File size720
Date (UTC)20-May-2011
Time (UTC)23:33
PlatformNot applicable
File nameIa64_microsoft-windows-p..ooler-core-localspl_31bf3856ad364e35_6.1.7600.20970_none_3082ccd80d19ae31.manifest
File versionNot applicable
File size4,844
Date (UTC)20-May-2011
Time (UTC)23:34
PlatformNot applicable
File nameIa64_microsoft-windows-p..ooler-core-localspl_31bf3856ad364e35_6.1.7601.21731_none_329569d80a1ec3b0.manifest
File versionNot applicable
File size4,844
Date (UTC)20-May-2011
Time (UTC)23:34
PlatformNot applicable
Properties

Article ID: 2549657 - Last Review: 10/09/2014 13:22:00 - Revision: 3.0

Windows Server 2008 R2 Enterprise, Windows Server 2008 R2 Datacenter, Windows Server 2008 R2 for Itanium-Based Systems, Windows Server 2008 R2 Foundation, Windows Server 2008 R2 Standard, Windows Web Server 2008 R2, Windows 7 Enterprise, Windows 7 Home Basic, Windows 7 Home Premium, Windows 7 Professional, Windows 7 Starter, Windows 7 Ultimate

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