PK41446; Possible response buffer corruption after closed connection error
Downloadable files
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.
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