From e81800f6a81a192fb784da45aaecc076628d82df Mon Sep 17 00:00:00 2001
From: Kristof Provost <kp@FreeBSD.org>
Date: Wed, 13 Dec 2023 13:32:08 +0100
Subject: [PATCH] mcast: fix leaked igmp packets on multicast cleanup

When we release a multicast address (e.g. on interface shutdown) we may
still have packets queued in inm_scq. We have to free those, or we'll
leak memory.

Reviewed by:	glebius
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D43033
---
 sys/netinet/in_mcast.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/netinet/in_mcast.c b/sys/netinet/in_mcast.c
index f93c4b0dac8..3dc4fa27168 100644
--- a/sys/netinet/in_mcast.c
+++ b/sys/netinet/in_mcast.c
@@ -1181,6 +1181,7 @@ inm_purge(struct in_multi *inm)
 		free(ims, M_IPMSOURCE);
 		inm->inm_nsrc--;
 	}
+	mbufq_drain(&inm->inm_scq);
 }
 
 /*