From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B84661ED42 for ; Tue, 25 Jul 2023 11:10:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2062EC433CB; Tue, 25 Jul 2023 11:10:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1690283428; bh=rVmlYUVq5cs5Y1n4vRYSVDphrIs7ze3k8aCfLki1D0E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=B4aFp0ygu0+nttAyjx7soehlept+bjZYPitQY7lfsHt6RdV10Qa7D6uD8CgNT7TIT CMeS2wOpL6mv2bA1exQuwNHJu4W2E2C7vMl7el1UsAzf2fDs7PxFe5eChbztNKxaDp uvnZ277m7h/am3JTBkpGeXgf7Yzte0lnOWE5eB7Y= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Eric Dumazet , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.15 73/78] tcp: annotate data-races around icsk->icsk_user_timeout Date: Tue, 25 Jul 2023 12:47:04 +0200 Message-ID: <20230725104454.108733991@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230725104451.275227789@linuxfoundation.org> References: <20230725104451.275227789@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Eric Dumazet [ Upstream commit 26023e91e12c68669db416b97234328a03d8e499 ] This field can be read locklessly from do_tcp_getsockopt() Fixes: dca43c75e7e5 ("tcp: Add TCP_USER_TIMEOUT socket option.") Signed-off-by: Eric Dumazet Link: https://lore.kernel.org/r/20230719212857.3943972-11-edumazet@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/ipv4/tcp.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 95e3e32d211a7..cf486d75da836 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3305,7 +3305,7 @@ 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); @@ -3625,7 +3625,7 @@ static 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: @@ -4138,7 +4138,7 @@ static 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: -- 2.39.2