tcp: fix off-by-one bug on aborting window-probing socket

[ Upstream commit 3976535af0cb9fe34a55f2ffb8d7e6b39a2f8188 ]

Previously there is an off-by-one bug on determining when to abort
a stalled window-probing socket. This patch fixes that so it is
consistent with tcp_write_timeout().

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index d9e364c..ad0083f 100644 (file)
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -372,7 +372,7 @@ static void tcp_probe_timer(struct sock *sk)
                        return;
        }
 
-       if (icsk->icsk_probes_out > max_probes) {
+       if (icsk->icsk_probes_out >= max_probes) {
 abort:         tcp_write_err(sk);
        } else {
                /* Only send another probe if we didn't close things up. */