From patchwork Thu May 20 09:21:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 444059 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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham 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 3D674C43460 for ; Thu, 20 May 2021 11:10:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 21D4360C41 for ; Thu, 20 May 2021 11:10:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239735AbhETLLa (ORCPT ); Thu, 20 May 2021 07:11:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:56406 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240367AbhETLKC (ORCPT ); Thu, 20 May 2021 07:10:02 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id B093861D33; Thu, 20 May 2021 10:06:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621505212; bh=zIV/X3RDGm+3ThlybYosjhW5l3vnZrve28LxP00O7n4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Q4TCE+YMyN0R1yCxnhKIUvPVmVKJs+PiMdeEofvjemasvdYDkKeY0DJ7DZWuUHfa0 CMA6JPqnTKsQkjrui1wkiyexUqp/T0pFYgEqf3DDXO31VAgpJ87MrSrrj+Y6HtGoZw bvvVXrN6HS4MoV7Rz5Xm2lmdsC1y0DEmoFTVE3EE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hulk Robot , Yang Yingliang , Krzysztof Kozlowski , Sebastian Reichel , Sasha Levin Subject: [PATCH 4.4 031/190] power: supply: s3c_adc_battery: fix possible use-after-free in s3c_adc_bat_remove() Date: Thu, 20 May 2021 11:21:35 +0200 Message-Id: <20210520092103.197561824@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092102.149300807@linuxfoundation.org> References: <20210520092102.149300807@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Yang Yingliang [ Upstream commit 68ae256945d2abe9036a7b68af4cc65aff79d5b7 ] This driver's remove path calls cancel_delayed_work(). However, that function does not wait until the work function finishes. This means that the callback function may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling cancel_delayed_work_sync(), which ensures that the work is properly cancelled, no longer running, and unable to re-schedule itself. Reported-by: Hulk Robot Signed-off-by: Yang Yingliang Reviewed-by: Krzysztof Kozlowski Signed-off-by: Sebastian Reichel Signed-off-by: Sasha Levin --- drivers/power/s3c_adc_battery.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/power/s3c_adc_battery.c b/drivers/power/s3c_adc_battery.c index 0ffe5cd3abf6..06b412c43aa7 100644 --- a/drivers/power/s3c_adc_battery.c +++ b/drivers/power/s3c_adc_battery.c @@ -392,7 +392,7 @@ static int s3c_adc_bat_remove(struct platform_device *pdev) gpio_free(pdata->gpio_charge_finished); } - cancel_delayed_work(&bat_work); + cancel_delayed_work_sync(&bat_work); if (pdata->exit) pdata->exit();