diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 68a048472e5ffa3c9d7ec1b0f702b8f5034374e8..a3654d92981464da129d0efd58859e91920501fe 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -3207,6 +3207,7 @@ static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
 	i->ifindex = mreq->mr_ifindex;
 	i->alen = mreq->mr_alen;
 	memcpy(i->addr, mreq->mr_address, i->alen);
+	memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
 	i->count = 1;
 	i->next = po->mclist;
 	po->mclist = i;