From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8FF54C001E7 for ; Mon, 12 Apr 2021 09:43:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7EE4A61262 for ; Mon, 12 Apr 2021 09:43:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243467AbhDLJmM (ORCPT ); Mon, 12 Apr 2021 05:42:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:36446 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240454AbhDLJKS (ORCPT ); Mon, 12 Apr 2021 05:10:18 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 48B1561285; Mon, 12 Apr 2021 09:05:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1618218333; bh=r/X//ApDsyWNF/tt+ADyLbC57YUHIBrmiykx+q5JCmo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BhlqROOaesFmVfnOSmNt7I2O/1FAax7/nGMhJxLvj6EhVq+Zjyf+7RvYKLNkM6HLi dtn/ORvgHwrY66IAqrAdfF0vl/3+UrnqhVMGrXNyCuVEUTH1DUuhlE2ORE04zw9AA+ rGbCr+ZkvAEtFFj+5Zm0hF5eyrWIoVKJOW3gPb/k= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Paolo Abeni , Mat Martineau , "David S. Miller" , Sasha Levin Subject: [PATCH 5.11 157/210] mptcp: revert "mptcp: provide subflow aware release function" Date: Mon, 12 Apr 2021 10:41:02 +0200 Message-Id: <20210412084021.230371028@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210412084016.009884719@linuxfoundation.org> References: <20210412084016.009884719@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Paolo Abeni [ Upstream commit 0a3cc57978d1d1448312f8973bd84dca4a71433a ] This change reverts commit ad98dd37051e ("mptcp: provide subflow aware release function"). The latter introduced a deadlock spotted by syzkaller and is not needed anymore after the previous commit. Fixes: ad98dd37051e ("mptcp: provide subflow aware release function") Signed-off-by: Paolo Abeni Reviewed-by: Mat Martineau Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/mptcp/protocol.c | 55 ++------------------------------------------ 1 file changed, 2 insertions(+), 53 deletions(-) diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index de9f2509acbe..e337b35a368f 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -11,7 +11,6 @@ #include #include #include -#include #include #include #include @@ -20,7 +19,6 @@ #include #if IS_ENABLED(CONFIG_MPTCP_IPV6) #include -#include #endif #include #include @@ -3424,34 +3422,10 @@ static __poll_t mptcp_poll(struct file *file, struct socket *sock, return mask; } -static int mptcp_release(struct socket *sock) -{ - struct mptcp_subflow_context *subflow; - struct sock *sk = sock->sk; - struct mptcp_sock *msk; - - if (!sk) - return 0; - - lock_sock(sk); - - msk = mptcp_sk(sk); - - mptcp_for_each_subflow(msk, subflow) { - struct sock *ssk = mptcp_subflow_tcp_sock(subflow); - - ip_mc_drop_socket(ssk); - } - - release_sock(sk); - - return inet_release(sock); -} - static const struct proto_ops mptcp_stream_ops = { .family = PF_INET, .owner = THIS_MODULE, - .release = mptcp_release, + .release = inet_release, .bind = mptcp_bind, .connect = mptcp_stream_connect, .socketpair = sock_no_socketpair, @@ -3498,35 +3472,10 @@ void __init mptcp_proto_init(void) } #if IS_ENABLED(CONFIG_MPTCP_IPV6) -static int mptcp6_release(struct socket *sock) -{ - struct mptcp_subflow_context *subflow; - struct mptcp_sock *msk; - struct sock *sk = sock->sk; - - if (!sk) - return 0; - - lock_sock(sk); - - msk = mptcp_sk(sk); - - mptcp_for_each_subflow(msk, subflow) { - struct sock *ssk = mptcp_subflow_tcp_sock(subflow); - - ip_mc_drop_socket(ssk); - ipv6_sock_mc_close(ssk); - ipv6_sock_ac_close(ssk); - } - - release_sock(sk); - return inet6_release(sock); -} - static const struct proto_ops mptcp_v6_stream_ops = { .family = PF_INET6, .owner = THIS_MODULE, - .release = mptcp6_release, + .release = inet6_release, .bind = mptcp_bind, .connect = mptcp_stream_connect, .socketpair = sock_no_socketpair, -- 2.30.2