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tcp: Fix a data-race around sysctl_tcp_thin_linear_timeouts.

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While reading sysctl_tcp_thin_linear_timeouts, it can be changed
concurrently.  Thus, we need to add READ_ONCE() to its reader.

Fixes: 36e31b0af5 ("net: TCP thin linear timeouts")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kuniyuki Iwashima 2022-07-18 10:26:47 -07:00 committed by David S. Miller
parent e7d2ef837e
commit 7c6f2a86ca
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_timer.c
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@ -578,7 +578,7 @@ void tcp_retransmit_timer(struct sock *sk)
* linear-timeout retransmissions into a black hole
*/
if (sk->sk_state == TCP_ESTABLISHED &&
(tp->thin_lto || net->ipv4.sysctl_tcp_thin_linear_timeouts) &&
(tp->thin_lto || READ_ONCE(net->ipv4.sysctl_tcp_thin_linear_timeouts)) &&
tcp_stream_is_thin(tp) &&
icsk->icsk_retransmits <= TCP_THIN_LINEAR_RETRIES) {
icsk->icsk_backoff = 0;