From patchwork Wed Oct 13 08:55:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Yongjun X-Patchwork-Id: 12555117 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 00AECC433F5 for ; Wed, 13 Oct 2021 08:41:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D4BB760D43 for ; Wed, 13 Oct 2021 08:41:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234135AbhJMIn3 (ORCPT ); Wed, 13 Oct 2021 04:43:29 -0400 Received: from szxga02-in.huawei.com ([45.249.212.188]:14343 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235764AbhJMIn2 (ORCPT ); Wed, 13 Oct 2021 04:43:28 -0400 Received: from dggeml709-chm.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4HTm8y50qlz900t; Wed, 13 Oct 2021 16:36:34 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by dggeml709-chm.china.huawei.com (10.3.17.139) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.8; Wed, 13 Oct 2021 16:41:24 +0800 From: Wei Yongjun To: CC: Wei Yongjun , Marcel Holtmann , Johan Hedberg , Luiz Augusto von Dentz Subject: [PATCH v2] Bluetooth: Fix memory leak of hci device Date: Wed, 13 Oct 2021 16:55:01 +0800 Message-ID: <20211013085501.101286-1-weiyongjun1@huawei.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-Originating-IP: [10.175.113.25] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggeml709-chm.china.huawei.com (10.3.17.139) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Fault injection test reported memory leak of hci device as follows: unreferenced object 0xffff88800b858000 (size 8192): comm "kworker/0:2", pid 167, jiffies 4294955747 (age 557.148s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 ad 4e ad de .............N.. backtrace: [<0000000070eb1059>] kmem_cache_alloc_trace mm/slub.c:3208 [<00000000015eb521>] hci_alloc_dev_priv include/linux/slab.h:591 [<00000000dcfc1e21>] bpa10x_probe include/net/bluetooth/hci_core.h:1240 [<000000005d3028c7>] usb_probe_interface drivers/usb/core/driver.c:397 [<00000000cbac9243>] really_probe drivers/base/dd.c:517 [<0000000024cab3f0>] __driver_probe_device drivers/base/dd.c:751 [<00000000202135cb>] driver_probe_device drivers/base/dd.c:782 [<000000000761f2bc>] __device_attach_driver drivers/base/dd.c:899 [<00000000f7d63134>] bus_for_each_drv drivers/base/bus.c:427 [<00000000c9551f0b>] __device_attach drivers/base/dd.c:971 [<000000007f79bd16>] bus_probe_device drivers/base/bus.c:487 [<000000007bb8b95a>] device_add drivers/base/core.c:3364 [<000000009564d9ea>] usb_set_configuration drivers/usb/core/message.c:2171 [<00000000e4657087>] usb_generic_driver_probe drivers/usb/core/generic.c:239 [<0000000071ede518>] usb_probe_device drivers/usb/core/driver.c:294 [<00000000cbac9243>] really_probe drivers/base/dd.c:517 hci_alloc_dev() do not init the device's flag. And hci_free_dev() using put_device() to free the memory allocated for this device, but it calls just put_device(dev) only in case of HCI_UNREGISTER flag is set, So any error handing before hci_register_dev() success will cause memory leak. To avoid this behaviour we can using kfree() to release dev before hci_register_dev() success. Signed-off-by: Wei Yongjun diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c index 7827639ecf5c..4e3e0451b08c 100644 --- a/net/bluetooth/hci_sysfs.c +++ b/net/bluetooth/hci_sysfs.c @@ -86,6 +86,8 @@ static void bt_host_release(struct device *dev) if (hci_dev_test_flag(hdev, HCI_UNREGISTER)) hci_release_dev(hdev); + else + kfree(hdev); module_put(THIS_MODULE); }