From: Kuniyuki Iwashima <kuniyu@amazon.com>
To: "David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
David Ahern <dsahern@kernel.org>
Cc: Kuniyuki Iwashima <kuniyu@amazon.com>,
Kuniyuki Iwashima <kuni1840@gmail.com>, <netdev@vger.kernel.org>
Subject: [PATCH v1 net 09/15] tcp: Fix a data-race around sysctl_tcp_limit_output_bytes.
Date: Wed, 20 Jul 2022 09:50:20 -0700 [thread overview]
Message-ID: <20220720165026.59712-10-kuniyu@amazon.com> (raw)
In-Reply-To: <20220720165026.59712-1-kuniyu@amazon.com>
While reading sysctl_tcp_limit_output_bytes, it can be changed
concurrently. Thus, we need to add READ_ONCE() to its reader.
Fixes: 46d3ceabd8d9 ("tcp: TCP Small Queues")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
---
net/ipv4/tcp_output.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 88f7d51e6691..80c9bed73337 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2507,7 +2507,7 @@ static bool tcp_small_queue_check(struct sock *sk, const struct sk_buff *skb,
sk->sk_pacing_rate >> READ_ONCE(sk->sk_pacing_shift));
if (sk->sk_pacing_status == SK_PACING_NONE)
limit = min_t(unsigned long, limit,
- sock_net(sk)->ipv4.sysctl_tcp_limit_output_bytes);
+ READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_limit_output_bytes));
limit <<= factor;
if (static_branch_unlikely(&tcp_tx_delay_enabled) &&
--
2.30.2
next prev parent reply other threads:[~2022-07-20 16:53 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-20 16:50 [PATCH v1 net 00/15] sysctl: Fix data-races around ipv4_net_table (Round 5) Kuniyuki Iwashima
2022-07-20 16:50 ` [PATCH v1 net 01/15] tcp: Fix data-races around sysctl_tcp_dsack Kuniyuki Iwashima
2022-07-20 16:50 ` [PATCH v1 net 02/15] tcp: Fix a data-race around sysctl_tcp_app_win Kuniyuki Iwashima
2022-07-20 16:50 ` [PATCH v1 net 03/15] tcp: Fix a data-race around sysctl_tcp_adv_win_scale Kuniyuki Iwashima
2022-07-20 16:50 ` [PATCH v1 net 04/15] tcp: Fix a data-race around sysctl_tcp_frto Kuniyuki Iwashima
2022-07-20 16:50 ` [PATCH v1 net 05/15] tcp: Fix a data-race around sysctl_tcp_nometrics_save Kuniyuki Iwashima
2022-07-20 16:50 ` [PATCH v1 net 06/15] tcp: Fix data-races around sysctl_tcp_no_ssthresh_metrics_save Kuniyuki Iwashima
2022-07-20 16:50 ` [PATCH v1 net 07/15] tcp: Fix data-races around sysctl_tcp_moderate_rcvbuf Kuniyuki Iwashima
2022-07-20 16:50 ` [PATCH v1 net 08/15] tcp: Fix data-races around sysctl_tcp_workaround_signed_windows Kuniyuki Iwashima
2022-07-20 16:50 ` Kuniyuki Iwashima [this message]
2022-07-20 16:50 ` [PATCH v1 net 10/15] tcp: Fix a data-race around sysctl_tcp_challenge_ack_limit Kuniyuki Iwashima
2022-07-20 16:50 ` [PATCH v1 net 11/15] tcp: Fix a data-race around sysctl_tcp_min_tso_segs Kuniyuki Iwashima
2022-07-20 16:50 ` [PATCH v1 net 12/15] tcp: Fix a data-race around sysctl_tcp_tso_rtt_log Kuniyuki Iwashima
2022-07-20 16:50 ` [PATCH v1 net 13/15] tcp: Fix a data-race around sysctl_tcp_min_rtt_wlen Kuniyuki Iwashima
2022-07-20 16:50 ` [PATCH v1 net 14/15] tcp: Fix a data-race around sysctl_tcp_autocorking Kuniyuki Iwashima
2022-07-20 16:50 ` [PATCH v1 net 15/15] tcp: Fix a data-race around sysctl_tcp_invalid_ratelimit Kuniyuki Iwashima
2022-07-20 17:17 ` [PATCH v1 net 00/15] sysctl: Fix data-races around ipv4_net_table (Round 5) Eric Dumazet
2022-07-22 11:10 ` patchwork-bot+netdevbpf
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