IZ82593: POTENTIAL CRASH IN THE IDECDROM DRIVER DURING OPEN() APPLIES TO AIX 5300-10

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Potential systen crash while attempting to open an
  invalid
  idecdrom device. The stack will look similar to:
  
  --- CPU #0 ---
  pvthread+015500 STACK:
  [0001AD00]abend_trap+000000 ()
  [047A7690]idecdrom_open+000D90 (??, ??, ??, ??)
  [004AFC38]devcopen+000418 (??, ??, ??, ??, ??)
  [004AF2C0]rdevopen+000100 (??, ??, ??, ??, ??)
  [006D4930]bdev_open+000030 (F10006000F63FB10,
  0000800300008003,
     0000000000000000)
  [0064A038]spec_open+000278 (??, ??, ??, ??, ??)
  [004B906C]vnop_open+00046C (??, ??, ??, ??, ??)
  [00523204]openpnp+000544 (??, ??, ??, ??, ??, ??)
  [00523740]openpath+000100 (??, ??, ??, ??, ??, ??, ??)
  [00523BBC]copen+00023C (??, ??, ??, ??, ??)
  [00522C3C]kopen+00001C (??, ??, ??)
  [00003844].svc_instr+000144 ()
  [kdb_get_virtual_memory] no real storage @ 2FF21B40
  [D0132D38]D0132D38 ()
  [kdb_read_mem] no real storage @ FFFFFFFFFFF8D20
  

Local fix

• Do not call open on invalid device.
  

Problem summary

• crash with stack trace:
   0001AD00 abend_trap+000000 ()
   047A7690 idecdrom_open+000D90 (??, ??, ??, ??)
   004AFC38 devcopen+000418 (??, ??, ??, ??, ??)
   004AF2C0 rdevopen+000100 (??, ??, ??, ??, ??)
   006D4930 bdev_open+000030 (F10006000F63FB10,
  0000800300008003,
  0000000000000000)
   0064A038 spec_open+000278 (??, ??, ??, ??, ??)
   004B906C vnop_open+00046C (??, ??, ??, ??, ??)
   00523204 openpnp+000544 (??, ??, ??, ??, ??, ??)
   00523740 openpath+000100 (??, ??, ??, ??, ??, ??, ??)
   00523BBC copen+00023C (??, ??, ??, ??, ??)
   00522C3C kopen+00001C (??, ??, ??)
   00003844 .svc_instr+000144 ()
   kdb_get_virtual_memory  no real storage @ 2FF21B40
   D0132D38 D0132D38 ()
   kdb_read_mem  no real storage @ FFFFFFFFFFF8D20
  

Problem conclusion

• Validate minor number before using it as an index in an array.
  

Temporary fix

Comments

• 5300-09 - use AIX APAR IZ82756
  5300-10 - use AIX APAR IZ82593
  5300-11 - use AIX APAR IZ82729
  5300-12 - use AIX APAR IZ81724
  6100-02 - use AIX APAR IZ80403
  

APAR Information

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

  IZ74020

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

Fix information

• Fixed component name

  AIX 5.3

• Fixed component ID

  5765G0300

Applicable component levels

• R530 PSY U837921

     UP10/09/20 I 1000

PTF to Fileset Mapping

• U837921 devices.ide.cdrom.rte 5.3.10.2