Revision 319492

MFC r318734:
  Fix possible double releasing for SA reference.

  There are two possible ways how crypto callback are called: directly from
  caller and deffered from crypto thread.

  For inbound packets the direct call chain is the following:
   IPSEC_INPUT() method -> ipsec_common_input() -> xform_input() ->
   -> crypto_dispatch() -> crypto_invoke() -> crypto_done() ->
   -> xform_input_cb() -> ipsec[46]_common_input_cb() -> netisr_queue().

  The SA reference is held while crypto processing is not finished.
  The error handling code wrongly expected that crypto callback always called
  from the crypto thread context, and it did SA reference releasing in
  xform_input_cb(). But when the crypto callback called directly, in case of
  error (e.g. data authentification failed) the error handling in
  ipsec_common_input() also did SA reference releasing.

  To fix this, remove error handling from ipsec_common_input() and do it
  in xform_input() before crypto_dispatch().

  PR:		219356

MFC r318738:
  Fix possible double releasing for SA and SP references.

  There are two possible ways how crypto callback are called: directly from
  caller and deffered from crypto thread.

  For outbound packets the direct call chain is the following:
   IPSEC_OUTPUT() method -> ipsec[46]_common_output() ->
   -> ipsec[46]_perform_request() -> xform_output() ->
   -> crypto_dispatch() -> crypto_invoke() -> crypto_done() ->
   -> xform_output_cb() -> ipsec_process_done() -> ip[6]_output().

  The SA and SP references are held while crypto processing is not finished.
  The error handling code wrongly expected that crypto callback always called
  from the crypto thread context, and it did references releasing in
  xform_output_cb(). But when the crypto callback called directly, in case of
  error the error handling code in ipsec[46]_perform_request() also did
  references releasing.

  To fix this, remove error handling from ipsec[46]_perform_request() and do it
  in xform_output() before crypto_dispatch().

Approved by:	re (kib)