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* [PATCH] batman-adv: mcast: fix memory leak on deleting a batman-adv interface
@ 2024-01-17  5:22 Linus Lüssing
  0 siblings, 0 replies; only message in thread
From: Linus Lüssing @ 2024-01-17  5:22 UTC (permalink / raw)
  To: b.a.t.m.a.n; +Cc: Linus Lüssing, syzbot+ebe64cc5950868e77358

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

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)
 	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 */

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