APAR status
Closed as program error.
Error description
An MQ client application retrieving non-persistent messages from a queue using the readahead functionality has the potential to make an invalid memory access
Local fix
Problem summary
**************************************************************** USERS AFFECTED: This issue affects users of MQ client applications which use the readahead functionality to retrieve non-persistent messages from a queue. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: A small timing window existed in the MQ channel code where an internal value representing the get message options of the consuming application could be accessed by the channel after being freed on another thread. This could theoretically cause the channel to use an invalid value for the get message options. This issue was detected internally by IBM through code analysis, and has not been observed in any known customer deployment.
Problem conclusion
The MQ channel code within the queue manager has been updated to prevent this potential window for invalid memory access. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v8.0 8.0.0.7 v9.0 CD 9.0.4 v9.0 LTS 9.0.0.2 The latest available maintenance can be obtained from 'WebSphere MQ Recommended Fixes' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037 If the maintenance level is not yet available information on its planned availability can be found in 'WebSphere MQ Planned Maintenance Release Dates' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309 ---------------------------------------------------------------
Temporary fix
Comments
APAR Information
APAR number
IT20676
Reported component name
WMQ BASE MULTIP
Reported component ID
5724H7251
Reported release
800
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-05-19
Closed date
2017-05-31
Last modified date
2017-07-06
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
WMQ BASE MULTIP
Fixed component ID
5724H7251
Applicable component levels
R800 PSY
UP
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Document Information
Modified date:
06 July 2017