code.
Resurrect the state field in the struct secpolicy, it has
IPSEC_SPSTATE_ALIVE value when security policy linked in the chain,
and IPSEC_SPSTATE_DEAD value in all other cases. This field protects
from trying to unlink one security policy several times from the different
threads.
Take additional reference in the key_flush_spd() to be sure that policy
won't be freed from the different thread while we are sending SPDEXPIRE message.
Add KEY_FREESP() call to the key_unlink() to release additional reference
that we take when use key_getsp*() functions.
Differential Revision: https://reviews.freebsd.org/D1914
Tested by: Emeric POUPON <emeric.poupon at stormshield dot eu>
Reviewed by: hrs
Sponsored by: Yandex LLC
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