diff options
| author | Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-20 09:50:16 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-07-22 12:06:17 +0100 |
| commit | 8499a2454d9e8a55ce616ede9f9580f36fd5b0f3 (patch) | |
| tree | 180282d27d317a32fa51643db6677b71e3d59f14 | |
| parent | 706c6202a3589f290e1ef9be0584a8f4a3cc0507 (diff) | |
| download | linux-gpio-intel-8499a2454d9e8a55ce616ede9f9580f36fd5b0f3.tar.gz | |
tcp: Fix a data-race around sysctl_tcp_nometrics_save.
While reading sysctl_tcp_nometrics_save, 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>
| -rw-r--r-- | net/ipv4/tcp_metrics.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c index a501150deaa3b..9dcc418a26f29 100644 --- a/net/ipv4/tcp_metrics.c +++ b/net/ipv4/tcp_metrics.c @@ -329,7 +329,7 @@ void tcp_update_metrics(struct sock *sk) int m; sk_dst_confirm(sk); - if (net->ipv4.sysctl_tcp_nometrics_save || !dst) + if (READ_ONCE(net->ipv4.sysctl_tcp_nometrics_save) || !dst) return; rcu_read_lock(); |