K 10
svn:author
V 2
kp
K 8
svn:date
V 27
2023-07-09T15:26:15.946438Z
K 7
svn:log
V 809
if_bridge: fix potential panic

When a new bridge_rtnode is added it is added with a NULL brt_dst. The
brt_dst is set after the entry is added. This means there's a small
window where another core could also attempt to add this node, leading
to the code attempting to log that the MAC addresses moved to a new
interface.
Aside from that being a spurious log entry it also panics, because
obif is NULL (and we attempt to dereference it).

Avoid this by settings brt_dst before we insert the bridge_rtnode.
Assert that obif is non-NULL, as an extra precaution.

Reported by:	olivier@
Reviewed by:	zlei@
Differential Revision:	https://reviews.freebsd.org/D40147

(cherry picked from commit f3546eacf0daac55fe08b6ad5849b0e440f75ffb)

Git Hash:   9835aa0d7dea7776165c770d059de4d9ead86dd1
Git Author: kp@FreeBSD.org
END