IC92780: AFTER AN ACTIVEX CLIENT APPLICATION END, THE PROGRAM CRASHES IN MQAX200.DLL

Fix Pack 7.1.0.4 for WebSphere MQ V7.1
WebSphere MQ V7.5 Fix Pack 7.5.0.3

APAR status

• Closed as program error.

Error description

• An ActiveX application is called by another third party
  application. The application connects to a queue manager,
  performs some WebSphere MQ calls and disconnects correctly. The
  ActiveX application ends, then when the calling application
  ends a program crash can occur.
  
  WebSphere MQ traces show that the ActiveX application has
  terminated successfully and a dump of the crash may show that
  the crash originated from ~CMqOleApp.
  
  The same ActiveX application runs without error when using a
  WebSphere MQ Client for Windows Version 7.0.1
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  WebSphere MQ 7.1 and 7.5 users who are using WebSphere MQ
  Automation Classes for ActiveX (mqax200.dll)
  
  Platforms affected:
  Windows
  
  ****************************************************************
  PROBLEM SUMMARY:
  One of the destructors of MQAX200.dll frees the pointer to the
  control block and then accesses the same pointer as part of
  clean up causing access violation. This NULL pointer
  dereferencing caused the ActiveX application to crash while
  ending the application.
  

Problem conclusion

• The code is modified such that the destructor completes all the
  clean up first and then the pointer to control block is freed,
  such that the null pointer is not dereferenced
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following:
  
                     v7.1
  Platform           Fix Pack 7.1.0.4
  --------           --------------------
  Windows            7.1.0.4
  
  Version            v7.5
  --------           --------------------
  Fix available in:  7.5.0.3
  
  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 WINDOWS V7

• Fixed component ID

  5724H7220

Applicable component levels

• R710 PSY

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