tcp: fix validation of D-SACK
[ Upstream commit f779b2d60ab95c17f1e025778ed0df3ec2f05d75 ]
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index bef9f04..b6771f9 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1115,7 +1115,7 @@
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))