From patchwork Tue Aug 10 04:14:08 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: 12427833 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=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 68824C4338F for ; Tue, 10 Aug 2021 04:17:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5197D6054E for ; Tue, 10 Aug 2021 04:17:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237207AbhHJESA (ORCPT ); Tue, 10 Aug 2021 00:18:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35042 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237226AbhHJER4 (ORCPT ); Tue, 10 Aug 2021 00:17:56 -0400 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 443B9C0617A1; Mon, 9 Aug 2021 21:17:24 -0700 (PDT) Received: by mail-pl1-x636.google.com with SMTP id l11so7605646plk.6; Mon, 09 Aug 2021 21:17:24 -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=SvgciiztrVef8p8zryOlzKMWIbOXm14bnkz3tLt2Ce0=; b=BUnnRx+X4v+1TL2k/V2JSTPEo9aZKCrlBiUXDBNMmj2qULjq+uWnxD26UxR3lMTexU Y1IbO4KeN1RWknPDtprm+kuFAkvtHuy+Rg2EZWtEeeX92R2IW8V/D6ihkMeZaKE4CqQM rm/pVNEGvdwzleQzKqxFhcO9U2aBMac2Ej6S7ejapBsZiG/BOsAKi5S+QIplBduWFvYO zTo++1I0l9Lcin+KeB25+mLD24fuiBwOk5k9G7jO9dRJ3Hy/R/9HfvPscihKBhpdAQy2 6chz9ohNsU/noQUo4hIqjIgaynaQheYVolooSqy5Jsnifoced07RTeUbq4xcSgcwhXAn KeVA== 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=SvgciiztrVef8p8zryOlzKMWIbOXm14bnkz3tLt2Ce0=; b=gV5FvNTr+pg2aE1EccgbfgEciS2PS4oD8jiSYXf9n7QKLc60wjryTds+DEldxwdwml eNDDWkOUcB9X22o/lm/wl1EAa150ss1s0Rt1ofT6Voe/drXKDgNyHmbGU5X/yuXPDGRH gsSOKHIU2SNQrb3V66gfMGeD1k+KZINm9LA0KGmtYOAw7DTypIToFgHb6Fgv3n4/GOu1 FCD4g7pBmcsOV7SSPQKuk46LgxtRx/wQoIArt5p+Y63V8LSvRrrF6Y97DAKxG/BDMnhT prhIDMHECW5/ulVMt7ETDXEWI9IC4CwcnSk+jcU4+JE1xF9tiQFbXLzhc+yELaruUROo ua7Q== X-Gm-Message-State: AOAM530svx9+OEFBKiOR5stKtNXrgTJuiF+1wxDpPut8q690yqfZZWJd rNfRf0vR8BumUy1azWvLjhw= X-Google-Smtp-Source: ABdhPJyST7kdXNemvcmeYieJUDOCfvnVJRXrwbmK/xqHiFmHBNjJ96w9TdavrCr2KZ6DrKZpwpEcxg== X-Received: by 2002:a65:6910:: with SMTP id s16mr37421pgq.270.1628569043859; Mon, 09 Aug 2021 21:17:23 -0700 (PDT) Received: from localhost.localdomain ([118.200.190.93]) by smtp.gmail.com with ESMTPSA id b8sm20132478pjo.51.2021.08.09.21.17.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Aug 2021 21:17:23 -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 4/6] Bluetooth: serialize calls to sco_sock_{set,clear}_timer Date: Tue, 10 Aug 2021 12:14:08 +0800 Message-Id: <20210810041410.142035-5-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 Currently, calls to sco_sock_set_timer are made under the locked socket, but this does not apply to all calls to sco_sock_clear_timer. Both sco_sock_{set,clear}_timer should be serialized by lock_sock to prevent unexpected concurrent clearing/setting of timers. Additionally, since sco_pi(sk)->conn is only cleared under the locked socket, this change allows us to avoid races between sco_sock_clear_timer and the call to kfree(conn) in sco_conn_del. Signed-off-by: Desmond Cheong Zhi Xi --- net/bluetooth/sco.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c index 68b51e321e82..77490338f4fa 100644 --- a/net/bluetooth/sco.c +++ b/net/bluetooth/sco.c @@ -453,8 +453,8 @@ static void __sco_sock_close(struct sock *sk) /* Must be called on unlocked socket. */ static void sco_sock_close(struct sock *sk) { - sco_sock_clear_timer(sk); lock_sock(sk); + sco_sock_clear_timer(sk); __sco_sock_close(sk); release_sock(sk); sco_sock_kill(sk); @@ -1104,8 +1104,8 @@ static void sco_conn_ready(struct sco_conn *conn) BT_DBG("conn %p", conn); if (sk) { - sco_sock_clear_timer(sk); lock_sock(sk); + sco_sock_clear_timer(sk); sk->sk_state = BT_CONNECTED; sk->sk_state_change(sk); release_sock(sk);