diff options
| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-20 19:50:15 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-03 13:00:44 +0300 |
| commit | 81c45f49e678c999985ef315e0cfe200192d1c2d (patch) | |
| tree | 8eebe1c1c7206be2b9781a03a18ae5a48f0e399f /net | |
| parent | 312ce3901fd8c1194601457fc22e0f7932f0f28b (diff) | |
| download | linux-81c45f49e678c999985ef315e0cfe200192d1c2d.tar.xz | |
tcp: Fix a data-race around sysctl_tcp_frto.
commit 706c6202a3589f290e1ef9be0584a8f4a3cc0507 upstream.
While reading sysctl_tcp_frto, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp_input.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 875064ddb9ee..7db10f74c8fb 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -2135,7 +2135,7 @@ void tcp_enter_loss(struct sock *sk) * loss recovery is underway except recurring timeout(s) on * the same SND.UNA (sec 3.2). Disable F-RTO on path MTU probing */ - tp->frto = net->ipv4.sysctl_tcp_frto && + tp->frto = READ_ONCE(net->ipv4.sysctl_tcp_frto) && (new_recovery || icsk->icsk_retransmits) && !inet_csk(sk)->icsk_mtup.probe_size; } |