From patchwork Sat Nov 19 09:15:41 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Yingliang X-Patchwork-Id: 13049659 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 E7ECDC433FE for ; Sat, 19 Nov 2022 09:17:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231598AbiKSJRZ (ORCPT ); Sat, 19 Nov 2022 04:17:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41710 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229470AbiKSJRY (ORCPT ); Sat, 19 Nov 2022 04:17:24 -0500 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DCF436D967 for ; Sat, 19 Nov 2022 01:17:22 -0800 (PST) Received: from dggpemm500022.china.huawei.com (unknown [172.30.72.54]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4NDp1y5drszmVyf; Sat, 19 Nov 2022 17:16:54 +0800 (CST) Received: from dggpemm500007.china.huawei.com (7.185.36.183) by dggpemm500022.china.huawei.com (7.185.36.162) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Sat, 19 Nov 2022 17:17:20 +0800 Received: from huawei.com (10.175.103.91) by dggpemm500007.china.huawei.com (7.185.36.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Sat, 19 Nov 2022 17:17:20 +0800 From: Yang Yingliang To: , CC: , Subject: [PATCH v2] usb: roles: fix of node refcount leak in usb_role_switch_is_parent() Date: Sat, 19 Nov 2022 17:15:41 +0800 Message-ID: <20221119091541.1755640-1-yangyingliang@huawei.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.175.103.91] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm500007.china.huawei.com (7.185.36.183) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org I got the following report while doing device(mt6370-tcpc) load test with CONFIG_OF_UNITTEST and CONFIG_OF_DYNAMIC enabled: OF: ERROR: memory leak, expected refcount 1 instead of 2, of_node_get()/of_node_put() unbalanced - destroy cset entry: attach overlay node /i2c/pmic@34 The 'parent' returned by fwnode_get_parent() with refcount incremented. it needs be put after using. Fixes: 6fadd72943b8 ("usb: roles: get usb-role-switch from parent") Signed-off-by: Yang Yingliang --- v1 -> v2: Add description to how is the report generated. --- drivers/usb/roles/class.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c index dfaed7eee94f..289950e5fcfb 100644 --- a/drivers/usb/roles/class.c +++ b/drivers/usb/roles/class.c @@ -106,10 +106,14 @@ usb_role_switch_is_parent(struct fwnode_handle *fwnode) struct fwnode_handle *parent = fwnode_get_parent(fwnode); struct device *dev; - if (!parent || !fwnode_property_present(parent, "usb-role-switch")) + if (!parent || !fwnode_property_present(parent, "usb-role-switch")) { + if (parent) + fwnode_handle_put(parent); return NULL; + } dev = class_find_device_by_fwnode(role_class, parent); + fwnode_handle_put(parent); return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER); }