IT18248: MQ 7.5.0.7 AMS client MQGET or async consume fails but returns CompCode=MQCC_OK, Reason=MQRC_NONE

APAR status

• Closed as program error.

Error description

• In a certain scenario, the MQGET call returns incorrect results.
  
  The scenario is:
  - Advanced Message Security enabled.
  - Message is being browsed via client-side MQGET call, or
  server-side async consume.
  - MQGMO_CONVERT is included in the MQGMO.Options
  - Message is too large for the buffer supplied by the
  application.
  
  The expected outcome from this is CompCode=MQCC_FAILED,
  Reason=MQRC_TRUNCATED_MSG_FAILED.
  
  The actual outcome is CompCode=MQCC_OK, Reason=MQRC_NONE, which
  is the wrong outcome.
  
  This issue was introduced as an unintended side effect of the
  fix in IT14031.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users of 7.5.0.7 queue managers with applications operating in
  the scenario described.  If in doubt, consider any 7.5.0.7 queue
  manager operating with Advanced Message Security to be
  potentially affected by this issue.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  When an AMS-enabled async consume operation is browsing a
  message, it must internally use larger buffers to ensure the
  whole message is read and decrypted before data conversion is
  performed.  The internal logic MQ was using did not take account
  of the particular scenario described, and the successfully
  browsed-and-converted message was incorrectly passed to the
  application with a "success" return code.  In fact, it failed,
  because the application buffer was not big enough to receive the
  whole message.  The return codes should therefore have been
  CompCode=MQCC_FAILED, Reason=MQRC_TRUNCATED_MSG_FAILED.
  
  This issue was introduced as an unintended side effect of the
  fix in IT14031.
  

Problem conclusion

• The design of the fix for IT14031 has been revised so that the
  correct return condition of CompCode=MQCC_FAILED,
  Reason=MQRC_TRUNCATED_MSG_FAILED is achieved.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v7.5       7.5.0.8
  
  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 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

  5724H7241

Applicable component levels