Index: sys/netinet/tcp_lro.c
===================================================================
--- sys/netinet/tcp_lro.c
+++ sys/netinet/tcp_lro.c
@@ -381,8 +381,8 @@
 tcp_lro_rx_ipv6(struct lro_ctrl *lc, struct mbuf *m, struct ip6_hdr *ip6,
     struct tcphdr **th)
 {
-
-	/* XXX-BZ we should check the flow-label. */
+	if (ip6->ip6_flow != m->m_pkthdr.flowid)
+		return (TCP_LRO_CANNOT);
 
 	/* XXX-BZ We do not yet support ext. hdrs. */
 	if (ip6->ip6_nxt != IPPROTO_TCP)