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 D62E5C43219 for ; Mon, 15 Nov 2021 20:31:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AAA026323F for ; Mon, 15 Nov 2021 20:31:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350983AbhKOU3n (ORCPT ); Mon, 15 Nov 2021 15:29:43 -0500 Received: from mail.kernel.org ([198.145.29.99]:48896 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240133AbhKOSFn (ORCPT ); Mon, 15 Nov 2021 13:05:43 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4CB28632FD; Mon, 15 Nov 2021 17:42:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1636998170; bh=YsfQXydnnYVDsA8EUuw0r2UCfDO195lGpkkRTB6wsyk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uWRsPO2GAHU27QhIWR0/blTCf+JsSj5Ztq6SdT4ui5qYB8bhQGQ++8h20t3B1s7yY 4x7Ts/Kh22TaN78WIShdcgqOk6CMgL7yTIneoFqCrg4u5nlwuNRR2DbDNfeSNf2AyH yrSDv9TdJREr18yXHvSNmhGDM+Wbc9dwvXTc/yqw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hulk Robot , Saravana Kannan , "Rafael J. Wysocki" , Yang Yingliang , Sasha Levin Subject: [PATCH 5.10 413/575] driver core: Fix possible memory leak in device_link_add() Date: Mon, 15 Nov 2021 18:02:18 +0100 Message-Id: <20211115165358.043134263@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165343.579890274@linuxfoundation.org> References: <20211115165343.579890274@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yang Yingliang [ Upstream commit df0a18149474c7e6b21f6367fbc6bc8d0f192444 ] I got memory leak as follows: unreferenced object 0xffff88801f0b2200 (size 64): comm "i2c-lis2hh12-21", pid 5455, jiffies 4294944606 (age 15.224s) hex dump (first 32 bytes): 72 65 67 75 6c 61 74 6f 72 3a 72 65 67 75 6c 61 regulator:regula 74 6f 72 2e 30 2d 2d 69 32 63 3a 31 2d 30 30 31 tor.0--i2c:1-001 backtrace: [<00000000bf5b0c3b>] __kmalloc_track_caller+0x19f/0x3a0 [<0000000050da42d9>] kvasprintf+0xb5/0x150 [<000000004bbbed13>] kvasprintf_const+0x60/0x190 [<00000000cdac7480>] kobject_set_name_vargs+0x56/0x150 [<00000000bf83f8e8>] dev_set_name+0xc0/0x100 [<00000000cc1cf7e3>] device_link_add+0x6b4/0x17c0 [<000000009db9faed>] _regulator_get+0x297/0x680 [<00000000845e7f2b>] _devm_regulator_get+0x5b/0xe0 [<000000003958ee25>] st_sensors_power_enable+0x71/0x1b0 [st_sensors] [<000000005f450f52>] st_accel_i2c_probe+0xd9/0x150 [st_accel_i2c] [<00000000b5f2ab33>] i2c_device_probe+0x4d8/0xbe0 [<0000000070fb977b>] really_probe+0x299/0xc30 [<0000000088e226ce>] __driver_probe_device+0x357/0x500 [<00000000c21dda32>] driver_probe_device+0x4e/0x140 [<000000004e650441>] __device_attach_driver+0x257/0x340 [<00000000cf1891b8>] bus_for_each_drv+0x166/0x1e0 When device_register() returns an error, the name allocated in dev_set_name() will be leaked, the put_device() should be used instead of kfree() to give up the device reference, then the name will be freed in kobject_cleanup() and the references of consumer and supplier will be decreased in device_link_release_fn(). Fixes: 287905e68dd2 ("driver core: Expose device link details in sysfs") Reported-by: Hulk Robot Reviewed-by: Saravana Kannan Reviewed-by: Rafael J. Wysocki Signed-off-by: Yang Yingliang Link: https://lore.kernel.org/r/20210930085714.2057460-1-yangyingliang@huawei.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/base/core.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 2bc4db5ffe445..389d13616d1df 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -668,9 +668,7 @@ struct device_link *device_link_add(struct device *consumer, dev_bus_name(supplier), dev_name(supplier), dev_bus_name(consumer), dev_name(consumer)); if (device_register(&link->link_dev)) { - put_device(consumer); - put_device(supplier); - kfree(link); + put_device(&link->link_dev); link = NULL; goto out; } -- 2.33.0