From patchwork Wed Jul 21 09:38:32 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: 12390517 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 EA7B6C6377A for ; Wed, 21 Jul 2021 09:59:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D1C1761249 for ; Wed, 21 Jul 2021 09:59:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236340AbhGUJQe (ORCPT ); Wed, 21 Jul 2021 05:16:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46434 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237675AbhGUI6i (ORCPT ); Wed, 21 Jul 2021 04:58:38 -0400 Received: from mail-pf1-x434.google.com (mail-pf1-x434.google.com [IPv6:2607:f8b0:4864:20::434]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8E2FDC061574; Wed, 21 Jul 2021 02:39:13 -0700 (PDT) Received: by mail-pf1-x434.google.com with SMTP id o201so1822482pfd.1; Wed, 21 Jul 2021 02:39:13 -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=PjuFR6HuAqzaOBzOINC7ROg0fkvdUGdT6kDWetuSLNA=; b=SSCMiLxpMlxDqbev6KyNKRINcMP3ATB1bD6BU81Vvu2ZLhmmYWvvW7tLTpTRsZwiok X/zYaEqz1uBEy4/emehHUpmEcxqHijdIe8NcOQW0Z6Zs7uDseVws5e11QoXA27pSP9Um QApdrIp4/agvt8Kapy9jJd0pSsQFh83oL+uBU02Y7gfv2KWuG398YZ7CpCO/TxfBrrhL bR6qKXCIc5MiM3fOWgCmmi88NuFSUv46ylmwA7Ozn8qBpzvK9FJ/u1zFsuS+HXJeGGGr mu5mj32xp/g019exxf4psjgpRD3lq8noTrPiyVCMZbhdF7nDJPIrIOWiZFgZlCnAsO1B BPZQ== 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=PjuFR6HuAqzaOBzOINC7ROg0fkvdUGdT6kDWetuSLNA=; b=DY1jtTyM6JcojqYKo0k7cP+YhwedjIxFGM8kIgYL5HmFuQfE977rkVG0sxA1oC/81S OHw3VQALOYATL+pXIxRm9WDjbSG6fL7f6JKKthgZqbC3L1KGNOv3sCTD2wVxnVaoTZCK 8pyVdXGIly/YovOkdIcF0B0z73Y12SGipGwdZI37m6AjQeJVtutLG1th6lfR3hsm47vW pU4AF/1TFDHQPLzwi1gFELiX7JBYzgSvOzf4SBNNrL+fhR32MczxMaApK/jdQEVt5dma X1eZEdZGLIwCEbGpm53rSftpjqGlJNxdK3m/5QFwIoxsX35Dvj0YR5snRLsuLHA+LbFa qDSQ== X-Gm-Message-State: AOAM531X9CspJC1m3G1biwbnv8s7PYdOjVizqj5xIFUQF5G3y0sjqI6r InbNbmMd6PFd8t3rR31Ngu4= X-Google-Smtp-Source: ABdhPJyLWYQsZQ+eLcP51gJqr+yNhWz6CITIUAHfjWRVt8BqikE1aEmB7DhdUoi1JBVeW317BZfy/A== X-Received: by 2002:a63:e643:: with SMTP id p3mr34526522pgj.213.1626860353146; Wed, 21 Jul 2021 02:39:13 -0700 (PDT) Received: from localhost.localdomain ([118.200.190.93]) by smtp.gmail.com with ESMTPSA id j129sm27311956pfb.132.2021.07.21.02.39.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jul 2021 02:39:12 -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, matthieu.baerts@tessares.net, stefan@datenfreihafen.org 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 v3 2/2] Bluetooth: fix inconsistent lock state in rfcomm_connect_ind Date: Wed, 21 Jul 2021 17:38:32 +0800 Message-Id: <20210721093832.78081-3-desmondcheongzx@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210721093832.78081-1-desmondcheongzx@gmail.com> References: <20210721093832.78081-1-desmondcheongzx@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Commit fad003b6c8e3d ("Bluetooth: Fix inconsistent lock state with RFCOMM") fixed a lockdep warning due to sk->sk_lock.slock being acquired without disabling softirq while the lock is also used in softirq context. This was done by disabling interrupts before calling bh_lock_sock in rfcomm_sk_state_change. Later, this was changed in commit e6da0edc24ee ("Bluetooth: Acquire sk_lock.slock without disabling interrupts") to disable softirqs only. However, there is another instance of sk->sk_lock.slock being acquired without disabling softirq in rfcomm_connect_ind. This patch fixes this by disabling local bh before the call to bh_lock_sock. Signed-off-by: Desmond Cheong Zhi Xi --- net/bluetooth/rfcomm/sock.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c index ae6f80730561..d8734abb2df4 100644 --- a/net/bluetooth/rfcomm/sock.c +++ b/net/bluetooth/rfcomm/sock.c @@ -974,6 +974,7 @@ int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc * if (!parent) return 0; + local_bh_disable(); bh_lock_sock(parent); /* Check for backlog size */ @@ -1002,6 +1003,7 @@ int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc * done: bh_unlock_sock(parent); + local_bh_enable(); if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags)) parent->sk_state_change(parent);