IBM Support

PK41446; Possible response buffer corruption after closed connection error

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Abstract

Following a closed connection error it is possible for the webcontainer to include data which is part of the response to a first request in the response to a second request.

Download Description

PK41446 resolves the following problem:

ERROR DESCRIPTION:
In some scenarios after a closed connection error the webcontainer may corrupt a buffer being used to send a response.

LOCAL FIX:
none

PROBLEM SUMMARY

USERS AFFECTED:
All users of a version 6.0 IBM® WebSphere® Application Server which receives a closed connection error.

PROBLEM DESCRIPTION:
Following a closed connection error it is possible for the webcontainer to include data which is part of the response to a first request in the response to a second request.

RECOMMENDATION:
None

If a closed connection exception occurs, for example because a request is canceled whilst a response to the request is still being sent, based on timing the following three scenarios are possible:

- Things clean-up correctly and no problem occurs. This is the most likely outcome.
- Some response data of the cancelled request is added to the response of a subsequent request.
- Some response data for a first subsequent request is added to the response of a different subsequent request.

However, note that APAR PK26825 which was included in versions 6.0.2.15 and 6.1.0.2 almost completely removes the possibility of this problem occurring.


PROBLEM CONCLUSION:
The webcontainer has been updated to ensure that a closed connection exception cannot cause data intended for the response to a first request to be added to the response of a second request. Further, checking has been added to the webcontainer such that if a similar data crossover occurs, but in different circumstances, the affected request(s) fail with a possible data corruption exception.

The fix for this APAR is currently targeted for inclusion in fixpacks 6.0.2.21 and 6.1.0.9.

Please refer to the recommended updates page for delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Prerequisites

Please download the UpdateInstaller below to install this fix.

[{"PRLabel":"UpdateInstaller","PRLang":"US English","PRSize":"7250000","PRPlat":{"label":"AIX","code":"PF002"},"PRURL":"http://www.ibm.com/support/docview.wss?rs=180&uid=swg21205991"}]

Installation Instructions

Please review the readme.txt for detailed installation instructions.

[{"INLabel":"Readme","INLang":"US English","INSize":"5909","INURL":"ftp://public.dhe.ibm.com/software/websphere/appserv/support/fixes/PK41446/readme.txt"}]

Download Package

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Technical Support

Contact IBM Support using SR (http://www-306.ibm.com/software/support/probsub.html), visit the WebSphere Application Server Support Web site (http://www.ibm.com/software/webservers/appserv/was/support/), or contact 1-800-IBM-SERV(U.S. only).

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Document Information

More support for:
WebSphere Application Server

Software version:
6.1.0.7, 6.1.0.5, 6.1.0.3, 6.1.0.2, 6.1.0.1, 6.1, 6.0.2.9, 6.0.2.8, 6.0.2.7, 6.0.2.6, 6.0.2.5, 6.0.2.4, 6.0.2.3, 6.0.2.2, 6.0.2.19, 6.0.2.17, 6.0.2.15, 6.0.2.13, 6.0.2.11, 6.0.2.1, 6.0.2

Operating system(s):
AIX, HP-UX, IBM i, Linux, Solaris, Windows

Document number:
574059

Modified date:
15 June 2018

UID

swg24015854

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