From patchwork Thu Apr 1 16:57:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Abeni X-Patchwork-Id: 414150 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=-15.8 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 autolearn=ham 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 4C6FCC43600 for ; Thu, 1 Apr 2021 18:03:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 105F66124C for ; Thu, 1 Apr 2021 18:03:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237118AbhDASDX (ORCPT ); Thu, 1 Apr 2021 14:03:23 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:45220 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237032AbhDAR7W (ORCPT ); Thu, 1 Apr 2021 13:59:22 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1617299959; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hg5lDUjDIV35CST3SAEwKb0ItcnfppBDuUprlCff6EM=; b=L5D89mfm8rrZnIsQ766LReI3R5/aAcOA5MZYrtFuhSxTQE9Q7wHyDqpja51r2zmtR1wM6a +TO7tgiehis1qbZzUjwgu92pW7pMnoB8hn1aL0xI/Ax5Yyc8oznn4Gs2jduLaIDf/QdliT kWsgh+c7f7CInAgVqFZ1lcF0cVDEoaU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-245-mRmZ1xVZNXmvFUIOjOwkDg-1; Thu, 01 Apr 2021 12:58:12 -0400 X-MC-Unique: mRmZ1xVZNXmvFUIOjOwkDg-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 345A91019623; Thu, 1 Apr 2021 16:58:11 +0000 (UTC) Received: from gerbillo.redhat.com (ovpn-114-240.ams2.redhat.com [10.36.114.240]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0C1AF19C46; Thu, 1 Apr 2021 16:58:09 +0000 (UTC) From: Paolo Abeni To: netdev@vger.kernel.org Cc: mptcp@lists.linux.dev, "David S. Miller" , Jakub Kicinski Subject: [PATCH net 2/2] mptcp: revert "mptcp: provide subflow aware release function" Date: Thu, 1 Apr 2021 18:57:45 +0200 Message-Id: In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org 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 Acked-by: Florian Westphal --- 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 e06cea0a3c54..4bde960e19dc 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 @@ -3464,34 +3462,10 @@ 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, @@ -3583,35 +3557,10 @@ 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,