From mboxrd@z Thu Jan 1 00:00:00 1970 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=-19.4 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=unavailable 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 53E6AC18E7B for ; Mon, 10 May 2021 12:33:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2491061432 for ; Mon, 10 May 2021 12:33:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346556AbhEJMby (ORCPT ); Mon, 10 May 2021 08:31:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:46148 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237179AbhEJLLb (ORCPT ); Mon, 10 May 2021 07:11:31 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 051E461919; Mon, 10 May 2021 11:07:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620644864; bh=/PZsmNOAHWc+djAPVac4wuQz4zH8jRh/xYnwOEZUpFc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bHMEmXWVATF2N3afCOGk7OAlTir5u7YH7EDqiYCO3u7Slht8FI4u+oY/gQ5ja2w+M ZVIPcezCg4qZLLZ6gG8yyBgPDvZnQeg63F1R2KiFEZWGXMc0BZJaanzNS8PjYXNbry dj1SjjNQvPDBazO0fXh2pqG/Ut8WZ/JeSIuBD8Us= 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 5.12 228/384] power: supply: s3c_adc_battery: fix possible use-after-free in s3c_adc_bat_remove() Date: Mon, 10 May 2021 12:20:17 +0200 Message-Id: <20210510102022.416886661@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210510102014.849075526@linuxfoundation.org> References: <20210510102014.849075526@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 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/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 a2addc24ee8b..3e3a598f114d 100644 --- a/drivers/power/supply/s3c_adc_battery.c +++ b/drivers/power/supply/s3c_adc_battery.c @@ -395,7 +395,7 @@ 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(); -- 2.30.2