From patchwork Tue Aug 10 04:14:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Desmond Cheong Zhi Xi X-Patchwork-Id: 12427839 X-Patchwork-Delegate: luiz.dentz@gmail.com 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,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 97D67C4338F for ; Tue, 10 Aug 2021 04:17:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 723736054E for ; Tue, 10 Aug 2021 04:17:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237399AbhHJESE (ORCPT ); Tue, 10 Aug 2021 00:18:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35046 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237242AbhHJER4 (ORCPT ); Tue, 10 Aug 2021 00:17:56 -0400 Received: from mail-pl1-x62f.google.com (mail-pl1-x62f.google.com [IPv6:2607:f8b0:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 350CEC0613D3; Mon, 9 Aug 2021 21:17:33 -0700 (PDT) Received: by mail-pl1-x62f.google.com with SMTP id d17so19210145plr.12; Mon, 09 Aug 2021 21:17:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=OIcoax9PQR0R3OnS5s26gNkuo62hz7EbqgNWPiTkgQM=; b=lAH95ClMQCGVsVezjaAKFYn2KOwKLL38WigaMEuHcmdwKJrXLdhdlfBf+6mNuxQv2D G5+p2a0jm3H+rBVWMN5ojVgcHbBG87vq+KGdk/R9FUVvQNKcAXw8PauG+f+8pnhMTiHw uxjHra7w5+S39KfkMVk8Bw5/Cte+uKXNLg5c67WAy6OBxK92uOHn7QgfxNgYgvlLpUA5 S4qEXAWVpWQFwIOaj5iKii0jGzQJeEu7v44R7B9cofNeG8RNuinzGld7YNqQqGRvG7XD UVNetqQlFPfbe+voiQZRr/gEkXHH7JTdYuW5u/J0YaxcRo2RCdeMYvyryjG8qdNprQbh FXyw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=OIcoax9PQR0R3OnS5s26gNkuo62hz7EbqgNWPiTkgQM=; b=G00zuEMTMf3Hln5Mt+lQ+JnXiiiM6TZG2qQ/urLlDo3YtS8zTsMK+o9fIDoksuVN/M Ppx/yOJck3mKnyCtFgEiOOxtko7u4rO5zaqdYH/I1jFdx9eUZ22xnLs4LMPvsvQPz9XW QzcaDQNPVMpzykOTDNgq8XVV5rZq+9KQG+5gzFGnQ5xOn2SRztvsrC+BAAFHBW1Fcx4j osiW3tcld5kTzyMWsLuqSRpF6+oM622B35v6zABNJigdijCmuXrqmg6LQixa9ntf+pA7 dMkKf/O+zDrxoozAqO0GeU1sBx7bmKNM7rTFt5B/6K7gJteg6gE/6hQOSWmefe6fEiXN cAPQ== X-Gm-Message-State: AOAM530lueWELQbu8TCacKpik8pUOd7f4DgCvDl76ZGrV5McFCdDiWP1 VJBphrgSRGjvPcJKmqcuQx4= X-Google-Smtp-Source: ABdhPJwfTlSiybFidKyx8OGCgRRGpma1nh/Zbq4L8DCNiIjmWbxmyUIYmQeEEzzwGsDYHxZXCKVe9Q== X-Received: by 2002:a63:8ac2:: with SMTP id y185mr159072pgd.179.1628569052608; Mon, 09 Aug 2021 21:17:32 -0700 (PDT) Received: from localhost.localdomain ([118.200.190.93]) by smtp.gmail.com with ESMTPSA id b8sm20132478pjo.51.2021.08.09.21.17.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Aug 2021 21:17:32 -0700 (PDT) From: Desmond Cheong Zhi Xi To: marcel@holtmann.org, johan.hedberg@gmail.com, luiz.dentz@gmail.com, davem@davemloft.net, kuba@kernel.org, sudipm.mukherjee@gmail.com Cc: Desmond Cheong Zhi Xi , linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, skhan@linuxfoundation.org, gregkh@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org Subject: [PATCH v6 6/6] Bluetooth: fix repeated calls to sco_sock_kill Date: Tue, 10 Aug 2021 12:14:10 +0800 Message-Id: <20210810041410.142035-7-desmondcheongzx@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210810041410.142035-1-desmondcheongzx@gmail.com> References: <20210810041410.142035-1-desmondcheongzx@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org In commit 4e1a720d0312 ("Bluetooth: avoid killing an already killed socket"), a check was added to sco_sock_kill to skip killing a socket if the SOCK_DEAD flag was set. This was done after a trace for a use-after-free bug showed that the same sock pointer was being killed twice. Unfortunately, this check prevents sco_sock_kill from running on any socket. sco_sock_kill kills a socket only if it's zapped and orphaned, however sock_orphan announces that the socket is dead before detaching it. i.e., orphaned sockets have the SOCK_DEAD flag set. To fix this, we remove the check for SOCK_DEAD, and avoid repeated calls to sco_sock_kill by removing incorrect calls in: 1. sco_sock_timeout. The socket should not be killed on timeout as further processing is expected to be done. For example, sco_sock_connect sets the timer then waits for the socket to be connected or for an error to be returned. 2. sco_conn_del. This function should clean up resources for the connection, but the socket itself should be cleaned up in sco_sock_release. 3. sco_sock_close. Calls to sco_sock_close in sco_sock_cleanup_listen and sco_sock_release are followed by sco_sock_kill. Hence the duplicated call should be removed. Fixes: 4e1a720d0312 ("Bluetooth: avoid killing an already killed socket") Signed-off-by: Desmond Cheong Zhi Xi --- net/bluetooth/sco.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c index 77490338f4fa..98a881586512 100644 --- a/net/bluetooth/sco.c +++ b/net/bluetooth/sco.c @@ -97,8 +97,6 @@ static void sco_sock_timeout(struct work_struct *work) sk->sk_err = ETIMEDOUT; sk->sk_state_change(sk); release_sock(sk); - - sco_sock_kill(sk); sock_put(sk); } @@ -197,7 +195,6 @@ static void sco_conn_del(struct hci_conn *hcon, int err) sco_sock_clear_timer(sk); sco_chan_del(sk, err); release_sock(sk); - sco_sock_kill(sk); sock_put(sk); /* Ensure no more work items will run before freeing conn. */ @@ -404,8 +401,7 @@ static void sco_sock_cleanup_listen(struct sock *parent) */ static void sco_sock_kill(struct sock *sk) { - if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket || - sock_flag(sk, SOCK_DEAD)) + if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) return; BT_DBG("sk %p state %d", sk, sk->sk_state); @@ -457,7 +453,6 @@ static void sco_sock_close(struct sock *sk) sco_sock_clear_timer(sk); __sco_sock_close(sk); release_sock(sk); - sco_sock_kill(sk); } static void sco_skb_put_cmsg(struct sk_buff *skb, struct msghdr *msg,