From patchwork Thu May 20 09:21:34 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: 445325 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 92FD5C433B4 for ; Thu, 20 May 2021 11:10:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 77874611AB for ; Thu, 20 May 2021 11:10:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239729AbhETLL3 (ORCPT ); Thu, 20 May 2021 07:11:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:56404 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240368AbhETLKC (ORCPT ); Thu, 20 May 2021 07:10:02 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7F76761D3E; Thu, 20 May 2021 10:06:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621505210; bh=DKurEqkRn6cfph3aDC6+V3HTGwnsta1k7RlNAI8lM5Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PKRCqx0pPJqgA60N+y962YwKEaNS7CctKZPn0cpL+5z94urGF/SSzeevFN9CVVVav 376FsUZVsRcDs1z0iIXpBrrTdLhTyHq3CgSaL1BiBD3z2zmECaQ/qOaBTo4E4tInRW AcF4QLACA5sHHfzVTZpqUAbkvpJ24LeD0ywdygYw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hulk Robot , Yang Yingliang , Sebastian Reichel , Sasha Levin Subject: [PATCH 4.4 030/190] power: supply: generic-adc-battery: fix possible use-after-free in gab_remove() Date: Thu, 20 May 2021 11:21:34 +0200 Message-Id: <20210520092103.167885303@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 b6cfa007b3b229771d9588970adb4ab3e0487f49 ] 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 Signed-off-by: Sebastian Reichel Signed-off-by: Sasha Levin --- drivers/power/generic-adc-battery.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/power/generic-adc-battery.c b/drivers/power/generic-adc-battery.c index fedc5818fab7..86289f9da85a 100644 --- a/drivers/power/generic-adc-battery.c +++ b/drivers/power/generic-adc-battery.c @@ -379,7 +379,7 @@ static int gab_remove(struct platform_device *pdev) } kfree(adc_bat->psy_desc.properties); - cancel_delayed_work(&adc_bat->bat_work); + cancel_delayed_work_sync(&adc_bat->bat_work); return 0; }