IT22577: Memory leak with client MQCONNX when specifying multiple connection names

APAR status

• Closed as program error.

Error description

• Memory leak is observed with a multi threaded client
  application,  when the client connection information is supplied
  in MQCONNX with multiple connection names.
  
  ****************************
  MQCD     ClientConn = {MQCD_CLIENT_CONN_DEFAULT};
  MQCNO   cno = {MQCNO_DEFAULT};   /* Connect Options
                */
  
  strncpy(ClientConn.ConnectionName,
               "localhost(1111),localhost(2222)", --------- When
  multiple connection names are specified, memory leak is observed
               MQ_CONN_NAME_LENGTH);
  
  strncpy(ClientConn.ChannelName,
               "CLIENT.CHANNEL_QM",
               MQ_CHANNEL_NAME_LENGTH);
  
  /* Point the MQCNO to the client connection definition */
  cno.ClientConnPtr = &ClientConn;
  cno.Version = MQCNO_VERSION_2;
  
  MQCONNX("QM",                 /* queue manager
                   */
  	&cno,                                 /* connect options
                 */
  	&hQm,                               /* connection handle
               */
  	&CompCode,                    /* completion code
                 */
  	&Reason);                         /* reason code
                     */
  
  ****************************
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users connecting to queue manager with MQCONNX call and using
  the contents of the ClientConnOffset or ClientConnPtr fields of
  the MQCNO structure
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A coding error in the MQ client code meant that internal data
  structures representing the channel definition were not
  correctly freed when multiple connection names were suppled,
  leaking the memory associated with these structures.
  

Problem conclusion

• The MQ client code has been corrected to prevent this memory
  leak.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.11
  v9.0 LTS   9.0.0.5
  
  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

  IBM MQ BASE MP

• Fixed component ID

  5724H7251

Applicable component levels