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-rw-r--r--sys/netinet/tcp_sack.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/netinet/tcp_sack.c b/sys/netinet/tcp_sack.c
index aa096fa..2d0a2c1 100644
--- a/sys/netinet/tcp_sack.c
+++ b/sys/netinet/tcp_sack.c
@@ -392,6 +392,8 @@ tcp_sack_doack(struct tcpcb *tp, struct tcpopt *to, tcp_seq th_ack)
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_GT(sack.end, tp->snd_una) &&
SEQ_LEQ(sack.end, tp->snd_max))
sack_blocks[num_sack_blks++] = sack;
}
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