Index: sys/netinet6/icmp6.c
===================================================================
--- sys/netinet6/icmp6.c
+++ sys/netinet6/icmp6.c
@@ -658,7 +658,8 @@
 			n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
 			if (n)
 				n = ni6_input(n, off, pr);
-			/* XXX meaningless if n == NULL */
+			if (n == NULL)
+				break;
 			noff = sizeof(struct ip6_hdr);
 		} else {
 			u_char *p;