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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
@@ -592,6 +592,14 @@
* received new blocks from the other side.
*/
if (to->to_flags & TOF_SACK) {
+ /*
+ * Don't allow SACK holes to cover the FIN sequence
+ * space.
+ */
+ tcp_seq highdata = tp->snd_max;
+ if (__predict_false(tp->t_flags & TF_SENTFIN))
+ highdata--;
+
for (i = 0; i < to->to_nsacks; i++) {
bcopy((to->to_sacks + i * TCPOLEN_SACK),
&sack, sizeof(sack));
@@ -600,9 +608,9 @@
if (SEQ_GT(sack.end, sack.start) &&
SEQ_GT(sack.start, tp->snd_una) &&
SEQ_GT(sack.start, th_ack) &&
- SEQ_LT(sack.start, tp->snd_max) &&
+ SEQ_LT(sack.start, highdata) &&
SEQ_GT(sack.end, tp->snd_una) &&
- SEQ_LEQ(sack.end, tp->snd_max)) {
+ SEQ_LEQ(sack.end, highdata)) {
sack_blocks[num_sack_blks++] = sack;
} else if (SEQ_LEQ(sack.start, th_ack) &&
SEQ_LEQ(sack.end, th_ack)) {

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