From 501159696cb5204d94d03393e4bc5d82f2e348e6 Mon Sep 17 00:00:00 2001
From: Mark Johnston <markj@FreeBSD.org>
Date: Fri, 8 Jan 2021 13:32:04 -0500
Subject: [PATCH] igmp: Avoid leaking mbuf when source validation fails

PR:		252504
Submitted by:	Panagiotis Tsolakos <panagiotis.tsolakos@gmail.com>
MFC after:	3 days
---
 sys/netinet/igmp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/netinet/igmp.c b/sys/netinet/igmp.c
index ce4dc1c5784..21bce1ff885 100644
--- a/sys/netinet/igmp.c
+++ b/sys/netinet/igmp.c
@@ -1589,6 +1589,7 @@ igmp_input(struct mbuf **mp, int *offp, int proto)
 				if (nsrc * sizeof(in_addr_t) >
 				    UINT16_MAX - iphlen - IGMP_V3_QUERY_MINLEN) {
 					IGMPSTAT_INC(igps_rcv_tooshort);
+					m_freem(m);
 					return (IPPROTO_DONE);
 				}
 				/*