From patchwork Thu May 20 09:20:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 445426 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 DB373C433ED for ; Thu, 20 May 2021 10:50:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BF78A61001 for ; Thu, 20 May 2021 10:50:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238241AbhETKv6 (ORCPT ); Thu, 20 May 2021 06:51:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:48038 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238738AbhETKuO (ORCPT ); Thu, 20 May 2021 06:50:14 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9688A61CC3; Thu, 20 May 2021 09:59:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621504765; bh=JuJvN2X8mgQ++fbj0+mQZeOSw5hFw90gldP9RMnAi8w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tReFZK48RkBm5rcVaabsfT83P+Z2ZeTzTdMjjLWVlKD5pJAD4QDG1k13vaBJeWtsi dn2ghFXbFQftvzpMdDaatI6caEcbhaaPYPWvpHqzLB4/CrVfNkmrbae81uBb8NAvaT pz2R/b5hus8u+IeWF9yVtZts42qVstB1C1Pa4wb0= 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 4.9 037/240] power: supply: generic-adc-battery: fix possible use-after-free in gab_remove() Date: Thu, 20 May 2021 11:20:29 +0200 Message-Id: <20210520092109.898133796@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092108.587553970@linuxfoundation.org> References: <20210520092108.587553970@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/supply/generic-adc-battery.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/power/supply/generic-adc-battery.c b/drivers/power/supply/generic-adc-battery.c index f627b39f64bf..b77fd751945d 100644 --- a/drivers/power/supply/generic-adc-battery.c +++ b/drivers/power/supply/generic-adc-battery.c @@ -384,7 +384,7 @@ 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; }