[Bug 200210] adding vtnet to bridge results to kernel panic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200210

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kp
Date: Sat Jun 13 19:39:22 UTC 2015
New revision: 284348
URL: https://svnweb.freebsd.org/changeset/base/284348

Log:
  Fix panic when adding vtnet interfaces to a bridge

  vtnet interfaces are always in promiscuous mode (at least if the
  VIRTIO_NET_F_CTRL_RX feature is not negotiated with the host).  if_promisc()
on
  a vtnet interface returned ENOTSUP although it has IFF_PROMISC set. This
  confused the bridge code. Instead we now accept all enable/disable
promiscuous
  commands (and always keep IFF_PROMISC set).

  There are also two issues with the if_bridge error handling.

  If if_promisc() fails it uses bridge_delete_member() to clean up. This tries
to
  disable promiscuous mode on the interface. That runs into an assert, because
  promiscuous mode was never set in the first place. (That's the panic reported
in
  PR 200210.)
  We can only unset promiscuous mode if the interface actually is promiscuous.
  This goes against the reference counting done by if_promisc(), but only the
  first/last if_promic() calls can actually fail, so this is safe.

  A second issue is a double free of bif. It's already freed by
  bridge_delete_member().

  PR:        200210
  Differential Revision:    https://reviews.freebsd.org/D2804
  Reviewed by:    philip (mentor)

Changes:
  head/sys/dev/virtio/network/if_vtnet.c
  head/sys/net/if_bridge.c

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