From patchwork Wed Apr 7 09:19:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Yingliang X-Patchwork-Id: 12187527 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 95907C433B4 for ; Wed, 7 Apr 2021 09:15:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A79561359 for ; Wed, 7 Apr 2021 09:15:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345904AbhDGJPf (ORCPT ); Wed, 7 Apr 2021 05:15:35 -0400 Received: from szxga07-in.huawei.com ([45.249.212.35]:16812 "EHLO szxga07-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234354AbhDGJPf (ORCPT ); Wed, 7 Apr 2021 05:15:35 -0400 Received: from DGGEMS409-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4FFdwT5cVdz9wdf; Wed, 7 Apr 2021 17:13:13 +0800 (CST) Received: from huawei.com (10.175.103.91) by DGGEMS409-HUB.china.huawei.com (10.3.19.209) with Microsoft SMTP Server id 14.3.498.0; Wed, 7 Apr 2021 17:15:22 +0800 From: Yang Yingliang To: , , CC: , Subject: [PATCH -next] power: supply: s3c_adc_battery: fix possible use-after-free in s3c_adc_bat_remove() Date: Wed, 7 Apr 2021 17:19:03 +0800 Message-ID: <20210407091903.3268399-1-yangyingliang@huawei.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.175.103.91] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org 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 --- drivers/power/supply/s3c_adc_battery.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/power/supply/s3c_adc_battery.c b/drivers/power/supply/s3c_adc_battery.c index dc700066d7bc..68d31a3bee48 100644 --- a/drivers/power/supply/s3c_adc_battery.c +++ b/drivers/power/supply/s3c_adc_battery.c @@ -390,7 +390,7 @@ static int s3c_adc_bat_remove(struct platform_device *pdev) if (main_bat.charge_finished) free_irq(gpiod_to_irq(main_bat.charge_finished), NULL); - cancel_delayed_work(&bat_work); + cancel_delayed_work_sync(&bat_work); if (pdata->exit) pdata->exit();