diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 8cd2782a31e4..313bc995d526 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -657,7 +657,7 @@ static void igmp6_group_added(struct ifmcaddr6 *mc)
 {
 	struct net_device *dev = mc->idev->dev;
 	char buf[MAX_ADDR_LEN];
-
+	memset(&buf, 0, MAX_ADDR_LEN);
 	if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 	    IPV6_ADDR_SCOPE_LINKLOCAL)
 		return;