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 105C17C081; Wed, 21 Feb 2024 13:19:46 +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=1708521586; cv=none; b=B86UN69jtuW85LZu1qXmtLfihxvvGhspH9HNccsSNVeJ/KpCNbCLTPhg354Wn5SI1OwlosJsbUd7vJ2Sm3nhFtTGPFZe6KIFP0CZeb7Gw17FImjkdvQ/dZbEJ1ttee4ogdZuVZhOLXAWrF31ZfBF7Ku/k4IIt9O6PQkqmhxgAZI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708521586; c=relaxed/simple; bh=uw5ZCN0Z0v40JdxPGXvVyc57BlnaV7ikTVtpBY9Q/VI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rkQaDIaWTW2ESDQTbKQFldX+ddJ4HIO97Xl99yOwGHx7Djqt+WS3J0JWioMPPc36SOMYJFGfZE/M1h6pnH6c5ewvuXEZBiC7rtF1GLpSGX7Z7GepGr0TeN8C+7IsIyKWhQQYX3AH6O6zXb/naB8uk/nY81fAeu1Us1nZR3EuNXE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xR6GNXZI; 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="xR6GNXZI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74F21C433C7; Wed, 21 Feb 2024 13:19:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1708521585; bh=uw5ZCN0Z0v40JdxPGXvVyc57BlnaV7ikTVtpBY9Q/VI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xR6GNXZIeCoMWTP2ZfV7SuDEstF+TF1z4cI2cbWt8hwqGZHyrGWJz5vn2ESD0TBX6 MsEla6icsJ/jluNIZtz3nc1kKK8Tal4XriLRQU8A1SOKECAXfDDnrW3NIXdVxtbaT7 Xf74SmnIsn8eBohGdcMVyXGVHB0Vh6c8VYv/pu0o= 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 4.19 152/202] inet: read sk->sk_family once in inet_recv_error() Date: Wed, 21 Feb 2024 14:07:33 +0100 Message-ID: <20240221125936.605127957@linuxfoundation.org> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240221125931.742034354@linuxfoundation.org> References: <20240221125931.742034354@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 4.19-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 7c902a1efbbf..01952a520d6f 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1552,10 +1552,12 @@ 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