The branch stable/12 has been updated by markj:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=44851ff2f65de3bdf3b3fa469a7bb5546e77e170

commit 44851ff2f65de3bdf3b3fa469a7bb5546e77e170
Author:     Mark Johnston <[email protected]>
AuthorDate: 2021-01-08 18:32:04 +0000
Commit:     Mark Johnston <[email protected]>
CommitDate: 2021-01-11 14:41:55 +0000

    igmp: Avoid leaking mbuf when source validation fails
    
    PR:             252504
    Submitted by:   Panagiotis Tsolakos <[email protected]>
    
    (cherry picked from commit 501159696cb5204d94d03393e4bc5d82f2e348e6)
---
 sys/netinet/igmp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/netinet/igmp.c b/sys/netinet/igmp.c
index 6f35f8156d23..a68a5a1ca9dd 100644
--- a/sys/netinet/igmp.c
+++ b/sys/netinet/igmp.c
@@ -1533,6 +1533,7 @@ 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);
                                }
                                /*
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