D51721.diff
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	diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
	--- a/sys/netinet/tcp_input.c
	+++ b/sys/netinet/tcp_input.c
	@@ -3493,7 +3493,14 @@
	if (tp != NULL) {
	INP_LOCK_ASSERT(tptoinpcb(tp));
	}
	-
	+ /*
	+ * If more than one TCP specific rstreason should be supported,
	+ * ensure that no side channel is opened. In particular, consider
	+ * possible interactions with tcp_send_challenge_ack().
	+ * XXXMT: should we remove support for BANDLIM_UNLIMITED?
	+ */
	+ KASSERT(rstreason == BANDLIM_UNLIMITED \|\| rstreason == BANDLIM_TCP_RST,
	+ ("%s: unexpected rstreason %d", __func__, rstreason));
	/* Don't bother if destination was broadcast/multicast. */
	if ((tcp_get_flags(th) & TH_RST) \|\| m->m_flags & (M_BCAST\|M_MCAST))
	goto drop;