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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>
This commit is contained in:
Zheng Yan 2011-09-18 22:37:34 -04:00 committed by David S. Miller
parent e05c82d366
commit f779b2d60a
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_input.c
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@ -1124,7 +1124,7 @@ static int tcp_is_sackblock_valid(struct tcp_sock *tp, int is_dsack,
return 0;
/* ...Then it's D-SACK, and must reside below snd_una completely */
if (!after(end_seq, tp->snd_una))
if (after(end_seq, tp->snd_una))
return 0;
if (!before(start_seq, tp->undo_marker))