D35387.diff
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	diff --git a/sys/netinet/tcp_sack.c b/sys/netinet/tcp_sack.c
	--- a/sys/netinet/tcp_sack.c
	+++ b/sys/netinet/tcp_sack.c
	@@ -965,6 +965,18 @@
	}
	}
	out:
	+ KASSERT(SEQ_LT(hole->start, hole->end), ("%s: hole.start >= hole.end", __func__));
	+ KASSERT(SEQ_LT(hole->start, tp->snd_fack), ("%s: hole.start >= snd.fack", __func__));
	+ KASSERT(SEQ_LT(hole->end, tp->snd_fack), ("%s: hole.end >= snd.fack", __func__));
	+ KASSERT(SEQ_LT(hole->rxmit, tp->snd_fack), ("%s: hole.rxmit >= snd.fack", __func__));
	+ if (SEQ_GEQ(hole->start, hole->end) \|\|
	+ SEQ_GEQ(hole->start, tp->snd_fack) \|\|
	+ SEQ_GEQ(hole->end, tp->snd_fack) \|\|
	+ SEQ_GEQ(hole->rxmit, tp->snd_fack)) {
	+ log(LOG_CRIT,"tcp: invalid SACK hole (%u-%u,%u) vs fwd ack %u, ignoring.\n",
	+ hole->start, hole->end, hole->rxmit, tp->snd_fack);
	+ return (NULL);
	+ }
	return (hole);
	}