diff options
| author | Eric Dumazet <edumazet@google.com> | 2023-07-20 00:28:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-27 09:44:43 +0300 |
| commit | 3cf0a0f11d39e183000df4ce090409181834b677 (patch) | |
| tree | 5bad16970cd707c9c20b910711d00dab6a0b2659 /net/ipv4/tcp.c | |
| parent | 9c786d5faf3ad271138c14655bfc9f642d6c0c92 (diff) | |
| download | linux-3cf0a0f11d39e183000df4ce090409181834b677.tar.xz | |
tcp: annotate data-races around tp->notsent_lowat
[ Upstream commit 1aeb87bc1440c5447a7fa2d6e3c2cca52cbd206b ]
tp->notsent_lowat can be read locklessly from do_tcp_getsockopt()
and tcp_poll().
Fixes: c9bee3b7fdec ("tcp: TCP_NOTSENT_LOWAT socket option")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20230719212857.3943972-10-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/ipv4/tcp.c')
| -rw-r--r-- | net/ipv4/tcp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 50d674d35e52..8a441dfd258d 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3437,7 +3437,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level, int optname, err = tcp_repair_set_window(tp, optval, optlen); break; case TCP_NOTSENT_LOWAT: - tp->notsent_lowat = val; + WRITE_ONCE(tp->notsent_lowat, val); sk->sk_write_space(sk); break; case TCP_INQ: @@ -3913,7 +3913,7 @@ static int do_tcp_getsockopt(struct sock *sk, int level, val = tcp_time_stamp_raw() + tp->tsoffset; break; case TCP_NOTSENT_LOWAT: - val = tp->notsent_lowat; + val = READ_ONCE(tp->notsent_lowat); break; case TCP_INQ: val = tp->recvmsg_inq; |