diff options
| author | Kuniyuki Iwashima | 2022-07-20 09:50:24 -0700 |
|---|---|---|
| committer | David S. Miller | 2022-07-22 12:06:18 +0100 |
| commit | 1330ffacd05fc9ac4159d19286ce119e22450ed2 (patch) | |
| tree | 71218211e3caa701d1232cbd2c30248d338802eb /net/ipv4/tcp_input.c | |
| parent | 2455e61b85e9c99af38cd889a7101f1d48b33cb4 (diff) | |
tcp: Fix a data-race around sysctl_tcp_min_rtt_wlen.
While reading sysctl_tcp_min_rtt_wlen, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.
Fixes: f672258391b4 ("tcp: track min RTT using windowed min-filter")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_input.c')
| -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 d386a69b1c05..96d11f8ab729 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -3058,7 +3058,7 @@ static void tcp_fastretrans_alert(struct sock *sk, const u32 prior_snd_una, static void tcp_update_rtt_min(struct sock *sk, u32 rtt_us, const int flag) { - u32 wlen = sock_net(sk)->ipv4.sysctl_tcp_min_rtt_wlen * HZ; + u32 wlen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_min_rtt_wlen) * HZ; struct tcp_sock *tp = tcp_sk(sk); if ((flag & FLAG_ACK_MAYBE_DELAYED) && rtt_us > tcp_min_rtt(tp)) { |