From patchwork Fri Feb 24 19:53:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhengping Jiang X-Patchwork-Id: 13151752 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 49F5FC64ED8 for ; Fri, 24 Feb 2023 19:53:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229677AbjBXTxV (ORCPT ); Fri, 24 Feb 2023 14:53:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44148 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229670AbjBXTxT (ORCPT ); Fri, 24 Feb 2023 14:53:19 -0500 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B56A30B22 for ; Fri, 24 Feb 2023 11:53:18 -0800 (PST) Received: by mail-pf1-x44a.google.com with SMTP id h13-20020a056a00218d00b005a8da78efedso79793pfi.2 for ; Fri, 24 Feb 2023 11:53:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=lkRn+6AoxobFYVvnDPTVGQq+gGNHibmmav9mWkGQcVk=; b=ILZLCrgZS1VLizZWWAK+C1MzdNr6RID8mWa3hzE+XcEW2p6iM/BvO/yRxHWiOSEEgy gYSwauIfvjWlABo2DKzMfpSLuGdnPjEuKIUgTlKzhKRh+odB1SLOlZV+yDufYDWEhxUy WsDH90DLicnkiGnUWJwiT9OWnpMSKDl7RfsPud9BUtPeR+Ks+VTMRRYFBdUOI8SB5jhY NBaABFh0QiuVy14AjA9bAdJQRChJ7oHSMOTA4UYQCdBLtb4FybP1jZsLwElPtf9IXhLF w3I2g4LJ5yfkWDEc5tNZPkNydfd6+LFhQ/rnKnA/m9qv5RR6lMdOwz5AZm9QDj0iv95E BdGQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=lkRn+6AoxobFYVvnDPTVGQq+gGNHibmmav9mWkGQcVk=; b=wno8g+Nf+7vr6bffRvkcGymIDaeShD/Y6waTRPlS0/Oj3aChDm6zNjAc2mQADaX1i0 S9n6uDc8jDMM11OKW5xKx0HNLS+S8/mFhDbkQYJTI1oU9xnY6dajsHNse28Q2HvvpibG iobGdRGfw4GJAX4vNIAytI4rd6rPADMDYqih/PrXAnlzv0PMB09a0m+IbE4OLKp+C2Tu Nw097oNP1yYUBnD2RCpBCnUCLhdw1Nk0i/+Q/eCJitdC2kNPt5rdJ1Aq7XdBeSTwC8DI fPNYYdaI+13Ei2twZobh8Kz3YiaaEtOPAq2s7fEGCQjcTJgQziRLLcI6Z41nQEiDxC1D F0mw== X-Gm-Message-State: AO0yUKWycEY8Hyodx0MwO+JuSQ0Bc111H0pAzKdUOh7BFc0z0OVaUJUx xsej6m2GbgX8l8UTpD1MhWgH2hzX2Zm2JC/7PiOUsTk0kNYyrikbpxamaHE1/mGqVklM3OzpTiH albjmWCRZNpJENJCCZoBpDyS0EnMwf6Pi/S8QPfqcZl5KY0lPPen56S6Bp4qp+pf3Lk5U9d5Mk6 Ny X-Google-Smtp-Source: AK7set8uBBgqkM+ht7YzOeEtgi5m6MwPtlIpSVoxsGaDBblHFL+pwGXlPcFSCwhTOk7CHYOuazpqRQNCrhox X-Received: from jiangzp-glinux-dev.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:4c52]) (user=jiangzp job=sendgmr) by 2002:a17:903:2348:b0:199:6e3:187a with SMTP id c8-20020a170903234800b0019906e3187amr443395plh.6.1677268397322; Fri, 24 Feb 2023 11:53:17 -0800 (PST) Date: Fri, 24 Feb 2023 11:53:13 -0800 In-Reply-To: <20230224195313.1877313-1-jiangzp@google.com> Mime-Version: 1.0 References: <20230224195313.1877313-1-jiangzp@google.com> X-Mailer: git-send-email 2.39.2.722.g9855ee24e9-goog Message-ID: <20230224115310.kernel.v2.1.If0578b001c1f12567f2ebcac5856507f1adee745@changeid> Subject: [kernel PATCH v2 1/1] Bluetooth: hci_sync: clear workqueue before clear mgmt cmd From: Zhengping Jiang To: linux-bluetooth@vger.kernel.org, marcel@holtmann.org, luiz.dentz@gmail.com Cc: mmandlik@google.com, chromeos-bluetooth-upstreaming@chromium.org, Zhengping Jiang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Johan Hedberg , Paolo Abeni , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Clear cmd_sync_work queue before clearing the mgmt cmd list to avoid racing conditions which cause use-after-free. When powering off the adapter, the mgmt cmd list will be cleared. If a work is queued in the cmd_sync_work queue at the same time, it will cause the risk of use-after-free, as the cmd pointer is not checked before use. Signed-off-by: Zhengping Jiang --- Changes in v2: - Add function to clear the queue without stop the timer Changes in v1: - Clear cmd_sync_work queue before clearing the mgmt cmd list net/bluetooth/hci_sync.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c index 117eedb6f709..b70365dfff0c 100644 --- a/net/bluetooth/hci_sync.c +++ b/net/bluetooth/hci_sync.c @@ -636,6 +636,23 @@ void hci_cmd_sync_init(struct hci_dev *hdev) INIT_DELAYED_WORK(&hdev->adv_instance_expire, adv_timeout_expire); } +static void hci_pend_cmd_sync_clear(struct hci_dev *hdev) +{ + struct hci_cmd_sync_work_entry *entry, *tmp; + + mutex_lock(&hdev->cmd_sync_work_lock); + list_for_each_entry_safe(entry, tmp, &hdev->cmd_sync_work_list, list) { + if (entry->destroy) { + hci_req_sync_lock(hdev); + entry->destroy(hdev, entry->data, -ECANCELED); + hci_req_sync_unlock(hdev); + } + list_del(&entry->list); + kfree(entry); + } + mutex_unlock(&hdev->cmd_sync_work_lock); +} + void hci_cmd_sync_clear(struct hci_dev *hdev) { struct hci_cmd_sync_work_entry *entry, *tmp; @@ -4842,8 +4859,10 @@ int hci_dev_close_sync(struct hci_dev *hdev) if (!auto_off && hdev->dev_type == HCI_PRIMARY && !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) && - hci_dev_test_flag(hdev, HCI_MGMT)) + hci_dev_test_flag(hdev, HCI_MGMT)) { + hci_pend_cmd_sync_clear(hdev); __mgmt_power_off(hdev); + } hci_inquiry_cache_flush(hdev); hci_pend_le_actions_clear(hdev);