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Memory leak when an application uses the FwpsNetBufferListAssociateContext0 function in Windows 7 or Windows Server 2008 R2

Symptoms
Consider the following scenario:
  • You run a third-party application on a computer that is running Windows 7 or Windows Server 2008 R2.
  • The application uses the Windows Filtering Platform (WFP) callout driver or the Network Driver Interface Specification (NDIS) Lightweight Filters (LWF) driver.
  • The application uses the FwpsNetBufferListAssociateContext0 function to associate the driver’s context and a Net Buffer List (NBL).
In this scenario, a memory leak occurs.
Cause
This issue occurs because the FwpsNetBufferListRemoveContext0 function does not free the context of a WFP callout driver or NDIS LWF driver that is associated with an NBL.
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 apply this hotfix, 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 0.17xxxWindows 7 and Windows Server 2008 R2RTMGDR
    6.1.760 0.21xxxWindows 7 and Windows Server 2008 R2RTMLDR
    6.1.760 1.18xxxWindows 7 and Windows Server 2008 R2SP1GDR
    6.1.760 1.22xxxWindows 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
Netio.sys6.1.7601.17939240,49622-Aug-201217:16x86
Netio.sys6.1.7601.22176240,47229-Nov-201205:41x86
Fwpkclnt.sys6.1.7600.17178187,22429-Nov-201205:08x86
Tcpip.sys6.1.7600.171781,287,51229-Nov-201205:09x86
Fwpkclnt.sys6.1.7600.21385187,22429-Nov-201204:52x86
Tcpip.sys6.1.7600.213851,303,89629-Nov-201204:52x86
Fwpkclnt.sys6.1.7601.18014187,73629-Nov-201205:11x86
Tcpip.sys6.1.7601.180141,293,67229-Nov-201205:11x86
Fwpkclnt.sys6.1.7601.22176187,73629-Nov-201205:41x86
Tcpip.sys6.1.7601.221761,307,99229-Nov-201205:41x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Netio.sys6.1.7601.17939376,68822-Aug-201218:12x64
Netio.sys6.1.7601.22176376,68029-Nov-201206:08x64
Fwpkclnt.sys6.1.7600.17178287,57629-Nov-201205:54x64
Tcpip.sys6.1.7600.171781,893,72029-Nov-201205:54x64
Fwpkclnt.sys6.1.7600.21385287,57629-Nov-201205:43x64
Tcpip.sys6.1.7600.213851,877,35229-Nov-201205:44x64
Fwpkclnt.sys6.1.7601.18014288,08829-Nov-201206:11x64
Tcpip.sys6.1.7601.180141,913,19229-Nov-201206:11x64
Fwpkclnt.sys6.1.7601.22176288,08829-Nov-201206:08x64
Tcpip.sys6.1.7601.221761,901,92829-Nov-201206:08x64
For all supported IA-64-based versions of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Netio.sys6.1.7601.17939711,02422-Aug-201216:51IA-64
Netio.sys6.1.7601.22176711,00029-Nov-201204:55IA-64
Fwpkclnt.sys6.1.7600.17178482,15229-Nov-201204:57IA-64
Tcpip.sys6.1.7600.171783,789,65629-Nov-201204:58IA-64
Fwpkclnt.sys6.1.7600.21385482,13629-Nov-201204:44IA-64
Tcpip.sys6.1.7600.213853,809,12829-Nov-201204:44IA-64
Fwpkclnt.sys6.1.7601.18014482,15229-Nov-201204:54IA-64
Tcpip.sys6.1.7601.180143,796,82429-Nov-201204:54IA-64
Fwpkclnt.sys6.1.7601.22176482,13629-Nov-201204:55IA-64
Tcpip.sys6.1.7601.221763,822,44029-Nov-201204:55IA-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 FwpsNetBufferListAssociateContext0 function, go to 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_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17939_none_58923ff3139b4b9b.manifest
File versionNot applicable
File size2,540
Date (UTC)22-Aug-2012
Time (UTC)17:35
PlatformNot applicable
File nameX86_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22176_none_58ed74522cdc4266.manifest
File versionNot applicable
File size2,540
Date (UTC)29-Nov-2012
Time (UTC)06:08
PlatformNot applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.17178_none_b3021eabc7af25ce.manifest
File versionNot applicable
File size3,834
Date (UTC)29-Nov-2012
Time (UTC)05:28
PlatformNot applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.21385_none_b37dec92e0d792ab.manifest
File versionNot applicable
File size3,834
Date (UTC)29-Nov-2012
Time (UTC)05:14
PlatformNot applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.18014_none_b5255bf7c4a881df.manifest
File versionNot applicable
File size3,834
Date (UTC)29-Nov-2012
Time (UTC)05:48
PlatformNot applicable
File nameX86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22176_none_b57019ceddf4fbfd.manifest
File versionNot applicable
File size3,834
Date (UTC)29-Nov-2012
Time (UTC)06:12
PlatformNot applicable
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameAmd64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17939_none_b4b0db76cbf8bcd1.manifest
File versionNot applicable
File size2,542
Date (UTC)22-Aug-2012
Time (UTC)18:33
PlatformNot applicable
File nameAmd64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22176_none_b50c0fd5e539b39c.manifest
File versionNot applicable
File size2,542
Date (UTC)29-Nov-2012
Time (UTC)06:55
PlatformNot applicable
File nameAmd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.17178_none_0f20ba2f800c9704.manifest
File versionNot applicable
File size3,838
Date (UTC)29-Nov-2012
Time (UTC)06:33
PlatformNot applicable
File nameAmd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.21385_none_0f9c8816993503e1.manifest
File versionNot applicable
File size3,838
Date (UTC)29-Nov-2012
Time (UTC)06:13
PlatformNot applicable
File nameAmd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.18014_none_1143f77b7d05f315.manifest
File versionNot applicable
File size3,838
Date (UTC)29-Nov-2012
Time (UTC)06:53
PlatformNot applicable
File nameAmd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22176_none_118eb55296526d33.manifest
File versionNot applicable
File size3,838
Date (UTC)29-Nov-2012
Time (UTC)07:02
PlatformNot applicable
File nameWow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17939_none_bf0585c900597ecc.manifest
File versionNot applicable
File size1,166
Date (UTC)22-Aug-2012
Time (UTC)17:23
PlatformNot applicable
File nameWow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22176_none_bf60ba28199a7597.manifest
File versionNot applicable
File size1,166
Date (UTC)29-Nov-2012
Time (UTC)05:51
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
File nameIa64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17939_none_5893e3e913995497.manifest
File versionNot applicable
File size2,541
Date (UTC)22-Aug-2012
Time (UTC)18:25
PlatformNot applicable
File nameIa64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22176_none_58ef18482cda4b62.manifest
File versionNot applicable
File size2,541
Date (UTC)29-Nov-2012
Time (UTC)06:47
PlatformNot applicable
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.17178_none_b303c2a1c7ad2eca.manifest
File versionNot applicable
File size3,836
Date (UTC)29-Nov-2012
Time (UTC)06:37
PlatformNot applicable
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7600.21385_none_b37f9088e0d59ba7.manifest
File versionNot applicable
File size3,836
Date (UTC)29-Nov-2012
Time (UTC)06:18
PlatformNot applicable
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.18014_none_b526ffedc4a68adb.manifest
File versionNot applicable
File size3,836
Date (UTC)29-Nov-2012
Time (UTC)06:16
PlatformNot applicable
File nameIa64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.1.7601.22176_none_b571bdc4ddf304f9.manifest
File versionNot applicable
File size3,836
Date (UTC)29-Nov-2012
Time (UTC)06:50
PlatformNot applicable
File nameWow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.17939_none_bf0585c900597ecc.manifest
File versionNot applicable
File size1,166
Date (UTC)22-Aug-2012
Time (UTC)17:23
PlatformNot applicable
File nameWow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.1.7601.22176_none_bf60ba28199a7597.manifest
File versionNot applicable
File size1,166
Date (UTC)29-Nov-2012
Time (UTC)05:51
PlatformNot applicable
Properties

Article ID: 2789378 - Last Review: 01/10/2013 05:20:00 - Revision: 2.0

Windows 7 Service Pack 1, Windows 7 Enterprise, Windows 7 Home Basic, Windows 7 Home Premium, Windows 7 Professional, Windows 7 Starter, Windows 7 Ultimate, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Datacenter, Windows Server 2008 R2 Enterprise, Windows Server 2008 R2 for Itanium-Based Systems, Windows Server 2008 R2 Foundation, Windows Server 2008 R2 Standard, Windows Web Server 2008 R2

  • kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseadvanced KB2789378
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