K 10
svn:author
V 2
ae
K 8
svn:date
V 27
2019-05-27T12:41:41.437245Z
K 7
svn:log
V 434
Fix possible NULL pointer dereference.

bpf_mtap() can invoke catchpacket() for already detached descriptor.
And this can lead to NULL pointer dereference, since bd_bif pointer
was reset to NULL in bpf_detachd_locked(). To avoid this, use
NET_EPOCH_WAIT() when descriptor is removed from interface's descriptors
list. After the wait it is safe to modify descriptor's content.

Submitted by:	kib
Reported by:	slavash
MFC after:	1 week

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