D31420.diff
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	diff --git a/sys/netinet6/in6_mcast.c b/sys/netinet6/in6_mcast.c
	--- a/sys/netinet6/in6_mcast.c
	+++ b/sys/netinet6/in6_mcast.c
	@@ -374,9 +374,18 @@
	IN6_MULTI_LIST_LOCK();
	IF_ADDR_WLOCK(ifp);
	NET_EPOCH_ENTER(et);
	- inm = in6m_lookup_locked(ifp, group);
	+ /*
	+ * Does ifp support IPv6 multicasts?
	+ */
	+ if (ifp->if_afdata[AF_INET6] == NULL)
	+ error = ENODEV;
	+ else
	+ inm = in6m_lookup_locked(ifp, group);
	NET_EPOCH_EXIT(et);

	+ if (error != 0)
	+ goto out_locked;
	+
	if (inm != NULL) {
	/*
	* If we already joined this group, just bump the