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 AEBD45F54E; Tue, 13 Feb 2024 17:25:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707845154; cv=none; b=KbH93iEXhPS8ixp/RGr9HhmihgP8KvqV8zyF/OapFAwdI/jhaj22tCyVaR42C1CAmgmSGionPHiG7nuGMRl+Jncm7RId2JPXPC4W1BQAuOSziZPBQ45XsJEsANOPTrLPLr0XjeZTfLweOWMpPW8kgvUb2cb0QVPyaD1X8saE6xE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707845154; c=relaxed/simple; bh=tAM511Lr5zFymWyC4g61QBvwpzfwpkznC9sYHzSU8JY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Fj4zhtVyr8cQDk4sJkB1y+p6xRu7B7J6gCIaR2IxQdU+2u58R7eqU+OU9J85k4owLgnF6J6YwG9BUd6oM6fHYc0YUKdt3C1gT7bRX2WxZHgpK63QfCPe8ssAJifZb6W+2GemuYHgVjlO2CTM6odN4Oi4MkOdbvfnuu5BDALbXhc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=iWG2bxFA; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="iWG2bxFA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C957EC433C7; Tue, 13 Feb 2024 17:25:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1707845154; bh=tAM511Lr5zFymWyC4g61QBvwpzfwpkznC9sYHzSU8JY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iWG2bxFAmM0r180xM2dzgoizvbfPv5IsCWIpnDz+4XozVbtcAQs7gVPOoR2EPzuup b2zVt/8nTNXhC2XLlDrjhTiBBnryASSTEagUFAwwn/GDcc2/mMNRVsJ5akKkunub0E JefOrSMhVQpzpDX9M+5mlke2k6M4OFjY5+y18Wyg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Eric Dumazet , Willem de Bruijn , "David S. Miller" , Sasha Levin Subject: [PATCH 6.1 25/64] inet: read sk->sk_family once in inet_recv_error() Date: Tue, 13 Feb 2024 18:21:11 +0100 Message-ID: <20240213171845.550712437@linuxfoundation.org> X-Mailer: git-send-email 2.43.1 In-Reply-To: <20240213171844.702064831@linuxfoundation.org> References: <20240213171844.702064831@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit eef00a82c568944f113f2de738156ac591bbd5cd ] inet_recv_error() is called without holding the socket lock. IPv6 socket could mutate to IPv4 with IPV6_ADDRFORM socket option and trigger a KCSAN warning. Fixes: f4713a3dfad0 ("net-timestamp: make tcp_recvmsg call ipv6_recv_error for AF_INET6 socks") Signed-off-by: Eric Dumazet Cc: Willem de Bruijn Reviewed-by: Willem de Bruijn Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/ipv4/af_inet.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index 2f646335d218..9408dc3bb42d 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1637,10 +1637,12 @@ EXPORT_SYMBOL(inet_current_timestamp); int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) { - if (sk->sk_family == AF_INET) + unsigned int family = READ_ONCE(sk->sk_family); + + if (family == AF_INET) return ip_recv_error(sk, msg, len, addr_len); #if IS_ENABLED(CONFIG_IPV6) - if (sk->sk_family == AF_INET6) + if (family == AF_INET6) return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); #endif return -EINVAL; -- 2.43.0