IJ53415: ADD SANITY CHECKS TO NFS READDIR APPLIES TO AIX 7300-03

APAR status

• Closed as program error.

Error description

• A malformed NFS reply may cause AIX to crash.
  
  CRASH INFORMATION:
  CPU 0 CSA F000000030019600 at time of crash, error code
  for LEDs:
  30000000
  pvthread+01C100 STACK:
  [0000EE00]___strlen64+000000 ()
  [061BE08C]get_uid_gid+00028C (??, ??, ??, ??, ??, ??)
  [061BC8D0]fattr4_to_vattr+0003F0 (??, ??, ??, ??)
  [061BD198]nfs4_attrcache+000058 (??, ??, ??, ??)
  [061BD820]nfs4_cache_post_op_attr+000120 (??, ??, ??, ??)
  [061F5198]nfs4readdir_async+0004B8 (??)
  [0029B154]threadentry+000054 (??, ??, ??, ??)
  

Local fix

Problem summary

• AIX NFS4 client can crash when some Linux NFS4 servers send a
  malformed reply to readdir compound request.
  

Problem conclusion

• Make some sanity checks even if the overall status of the reply
  is "success".
  

Temporary fix

Comments

APAR Information

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

  IJ50975

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

Fix information

• Fixed component name

  AIX V7.3

• Fixed component ID

  5765CD300

Applicable component levels