The batman-adv multicast tracker TVLV handler is registered for the new batman-adv multicast packet type upon creating a batman-adv interface, but not unregistered again upon the interface's deletion, leading to a memory leak.

Fix this memory leak by calling the according TVLV handler unregister routine for the multicast tracker TVLV upon batman-adv interface deletion.

Fixes: 8ed36122d709 ("batman-adv: mcast: implement multicast packet reception and forwarding") Reported-by: syzbot+ebe64cc5950868e77358@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/000000000000beadc4060f0cbc23@google.com/ Signed-off-by: Linus Lüssing linus.luessing@c0d3.blue --- net/batman-adv/multicast.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index c8620905c2dc..38fab5e46ae2 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -2183,6 +2183,7 @@ void batadv_mcast_free(struct batadv_priv *bat_priv) cancel_delayed_work_sync(&bat_priv->mcast.work);

batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2); + batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST_TRACKER, 1); batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2);

/* safely calling outside of worker, as worker was canceled above */