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authorEric Dumazet2023-07-19 21:28:56 +0000
committerJakub Kicinski2023-07-20 12:34:18 -0700
commit26023e91e12c68669db416b97234328a03d8e499 (patch)
tree347237ef21eb0c921bbba69377f7345de10a5e27
parent1aeb87bc1440c5447a7fa2d6e3c2cca52cbd206b (diff)
tcp: annotate data-races around icsk->icsk_user_timeout
This field can be read locklessly from do_tcp_getsockopt() Fixes: dca43c75e7e5 ("tcp: Add TCP_USER_TIMEOUT socket option.") Signed-off-by: Eric Dumazet <edumazet@google.com> Link: https://lore.kernel.org/r/20230719212857.3943972-11-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
-rw-r--r--net/ipv4/tcp.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 2b2241e9b492..3e137e9a18f5 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3300,7 +3300,7 @@ EXPORT_SYMBOL(tcp_sock_set_syncnt);
void tcp_sock_set_user_timeout(struct sock *sk, u32 val)
{
lock_sock(sk);
- inet_csk(sk)->icsk_user_timeout = val;
+ WRITE_ONCE(inet_csk(sk)->icsk_user_timeout, val);
release_sock(sk);
}
EXPORT_SYMBOL(tcp_sock_set_user_timeout);
@@ -3620,7 +3620,7 @@ int do_tcp_setsockopt(struct sock *sk, int level, int optname,
if (val < 0)
err = -EINVAL;
else
- icsk->icsk_user_timeout = val;
+ WRITE_ONCE(icsk->icsk_user_timeout, val);
break;
case TCP_FASTOPEN:
@@ -4141,7 +4141,7 @@ int do_tcp_getsockopt(struct sock *sk, int level,
break;
case TCP_USER_TIMEOUT:
- val = icsk->icsk_user_timeout;
+ val = READ_ONCE(icsk->icsk_user_timeout);
break;
case TCP_FASTOPEN: