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tcp: fix validation of D-SACK
D-SACK is allowed to reside below snd_una. But the corresponding check in tcp_is_sackblock_valid() is the exact opposite. It looks like a typo. Signed-off-by: Zheng Yan <zheng.z.yan@intel.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1124,7 +1124,7 @@ static int tcp_is_sackblock_valid(struct tcp_sock *tp, int is_dsack,
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return 0;
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/* ...Then it's D-SACK, and must reside below snd_una completely */
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if (!after(end_seq, tp->snd_una))
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if (after(end_seq, tp->snd_una))
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return 0;
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if (!before(start_seq, tp->undo_marker))
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