PM82567: CORE ENGINE MEMORY CORRUPTION CRASH IN FREEBUFFER() FUNCTION WHEN USING FUNCTIONAL MAP WITH ICU CODE PAGE CONVERSION

APAR status

• Closed as program error.

Error description

• Core Engine memory corruption crash in FreeBuffer() function on
  when using WTX 8.3.0.5.  The problem appears may occur when the
  data requires a ICU code page conversion in a functional where
  the data is less than or equal to 256 bytes before conversion
  and greater that 256 bytes after conversion.
  
  The following is an example stack trace:
  
  /lib64/libc.so.6(+0x838f4)[0x200004788f4]
  /lib64/libc.so.6(cfree+0x76)[0x2000047e6d6]
  /opt/ibm/wtx/libs/libcoreapi.so(FreeBuffer+0x142)[0x200002d7dee]
  

Local fix

• WTXCQ - WTX00042252
  GM / GM
  Circumvention: None
  

Problem summary

• Users Affected:
  WebSphere Transformation Extender customers using functional
  maps and ICU character sets
  
  Problem Description:
  The core engine crashes freeing a buffer when a function map is
  called. The problem happens if ICU conversion is needed. When
  the input buffer is equal or less in length then 256 bytes and
  the result is greater than 256 bytes, the memory will be
  corrupted. as a result, undefined behavior including memory
  leaks and crashes is possible.
  
  Platforms Affected:
  All
  

Problem conclusion

• Corrected code to property free buffers after ICU conversion in
  functional maps.
  
  Delivered in:
  8.3.0.6, 8.4.0.4
  

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

  WTX FOR INT SER

• Fixed component ID

  5724M4010

Applicable component levels

• R820 PSY

     UP

• R830 PSY

     UP

• R840 PSY

     UP