bz 071c24dda8 In udp_input() when walking the pcblist we can come across
an inp marked FREED after the epoch(9) changes.
Check once we hold the lock and skip the inp if it is the case.

Contrary to IPv6 the locking of the inp is outside the multicast
section and hence a single check seems to suffice.

PR:		232192
Reviewed by:	mmacy, markj
Approved by:	re (kib)
Differential Revision:	https://reviews.freebsd.org/D17540
2018-10-12 22:51:45 +00:00
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