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authorKuniyuki Iwashima <kuniyu@amazon.com>2022-07-20 19:50:15 +0300
committerDavid S. Miller <davem@davemloft.net>2022-07-22 14:06:17 +0300
commit706c6202a3589f290e1ef9be0584a8f4a3cc0507 (patch)
treeddc3d4276299696711276fa93be5753c3586ed16 /net/ipv4
parent36eeee75ef0157e42fb6593dcc65daab289b559e (diff)
downloadlinux-706c6202a3589f290e1ef9be0584a8f4a3cc0507.tar.xz
tcp: Fix a data-race around sysctl_tcp_frto.
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>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp_input.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 8cf4fbd349ab..af376d7423d1 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2175,7 +2175,7 @@ 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;
}