K 10
svn:author
V 3
bms
K 8
svn:date
V 27
2009-09-12T18:55:15.461339Z
K 7
svn:log
V 841
Fix an API issue in leave processing for IPv4 multicast groups.
 * Do not assume that the group lookup performed by imo_match_group()
   is valid when ifp is NULL in this case.
 * Instead, return EADDRNOTAVAIL if the ifp cannot be resolved for the
   membership we are being asked to leave.

Caveat user:
 * The way IPv4 multicast memberships are implemented in the inpcb layer
   at the moment, has the side-effect that struct ip_moptions will
   still hold the membership, under the old ifp, until ip_freemoptions()
   is called for the parent inpcb.
 * The underlying issue is: the inpcb layer does not get notification
   of ifp being detached going away in a thread-safe manner.
   This is non-trivial to fix.

But hey, at least the kernel should't panic when you unplug a card.

PR:		138689
Submitted by:	Stef Walter
MFC after:	5 days

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