PH54546: DFHWB0004 issued for a possible loop in DFHWBCL and a task abends AEXZ.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CICS receives an invalid HTTP chunk.  When peaking for the chunk
  header in DFHWBCL it receives a buffer of all nulls.  While
  processing the chunk header the lack of CRLF causes CICS to
  loop through the data repeatedly.
  
  CICS goes into recovery and purges the runaway task, the
  transaction abends with code AEXZ:
  
  DFHAC2206 11:49:15 IYCKZCDA Transaction TRAN failed with abend
  AEXZ. Updates
    to local recoverable resources backed out.        
  
  The system log will output the following error message:
  
  DFHWB0004 A possible loop has been detected at offset
  X'FFFFFFFF' in module DFHWBCL.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: DFHWB0004 issued for a possible loop in *
  *                      DFHWBCL and a task abends AEXZ.         *
  ****************************************************************
  CICS receives an invalid HTTP chunk.  When peaking for the chunk
  header in DFHWBCL it receives a buffer of all nulls.  While
  processing the chunk header the lack of CRLF causes CICS to
  loop through the data repeatedly.  This leads to a DFHWB0004
  message and AEXZ abend.
  

Problem conclusion

• DFHWBCL has been updated to correctly handle an invalid HTTP
  chunk with a missing CRLF.
  

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:

  PH55862 UI93381

Modules/Macros

• DFHWBCL
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R300 PSY UI93381

     UP23/09/06 P F309

Fix is available

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