PI39365: STORAGE VIOLATIONS COMMAREA, TIOA X'96' BYTE CHANGED TO X'97' LOWER CASE 'O' TO LOWER CASE 'P'

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• You are running an application and send a commarea into a
  CICS/TS R5.2 region via EXCI.  When your application links to a
  program, using EXCI,  with a commarea the ninth position in the
  commarea has a particular value on the link.  After the link the
  ninth position in the commarea has a different value.
    As an example: The commarea coming into the region has a x'96'
  at the ninth position.  Once the application links to a program
  the commarea now has a x'97' in the ninth position of the
  commarea instead of the original x'96'.
  Additional Symptom(s) Search Keyword(s): KIXREVRER
  lower case letter o (which in ebcdic is x'96') is
  changed to a lower case letter p (x'97').
  lowercase uppercase upper case translate
  DFHSM0102 TIOA terminal I/O areas where byte that should be
  x'96' is changed to x'97'. Storage violations are detected
  because check zones don't match.
  additional symptom: MRO passing password from TOR to AOR
  second character is translated from a lower case o to a
  upper case P.  The application returns invalid password.
  If done directly to the AOR or if Upper case O is used
  then no failure.
  CSXM loops in DFHTMP01.  The directory element has been
  corrupted is at address 1A969018.  The next pointer should be
  1A969044 but is instead 1A979044.  The x'96' has been changed
  to a x'97'.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Data passed in a COMMAREA on a          *
  *                      distributed EXEC CICS LINK request is   *
  *                      corrupted. One byte is changed from     *
  *                      x'96' to x'97'.                         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A distributed program link request is made into CICS TS V5.2. In
  the reported case the request originated over EXCI, but could
  also originate from another connected CICS region. The request
  contains no application context data, but does contain user data
  in a commarea.
  DFHZATT is invoked to parse the incoming request. After
  processing the FMH5 and FMH43 headers, it begins searching for
  other items of contextual data. It tests field FMHCARGN to see
  if next data item is an Initial Application Context Data (ACD -
  x'95') record. It is not an ACD, and DFHZATT next attempts to
  test FMHCARGN to see if it is a Current Application Context Data
  (CAC - x'96') record.
  Prior to testing FMHCARGN for a x'96', the code incorrectly
  attempts to increase the current position in the buffer by the
  length of the record just read. There was no ACD so this was not
  valid, and moves the current position in the buffer forward
  unnecessarily. It happens that field FMHCARGN now points into
  user data in the commarea. If this byte happens to be x'96',
  then DFHZATT incorrectly assumes that Current Application
  Context Data is present.
  The x'96' byte is altered to x'97'
  

Problem conclusion

• DFHZATT has been updated to avoid the invalid increase of the
  current position pointer, thereby allowing the message to be
  parsed correctly.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UI27599

Modules/Macros

• DFHZATT
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R900 PSY UI27599

     UP15/05/22 P F505

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.