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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 CB20BC388F7 for ; Tue, 3 Nov 2020 21:04:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 90BBC21534 for ; Tue, 3 Nov 2020 21:04:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604437497; bh=K3JjGn2s3YNktszNbEQaLjClCEaPtQMgUPx/s76v/lE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=IE53qmBhLsLIdrCVOWTotaB5JllsvtNwuDRVF9m89U2tCn6YIfuX/HOEUb0FcA/Tl A4ob9CQeymK/8YFK2vfa7aiGcyM98wFox/CrDuA5/B+7ADhLsIQKak4ipMHkR0VPCX KvYl3nK1fPGeClKvMxnpr1RTyrJLyVXQVqvBDOfQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733277AbgKCVEz (ORCPT ); Tue, 3 Nov 2020 16:04:55 -0500 Received: from mail.kernel.org ([198.145.29.99]:43030 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388030AbgKCVEt (ORCPT ); Tue, 3 Nov 2020 16:04:49 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 07D51205ED; Tue, 3 Nov 2020 21:04:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604437488; bh=K3JjGn2s3YNktszNbEQaLjClCEaPtQMgUPx/s76v/lE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jqYZofIUow3TA0DLahgf/lRz/qOnwIf/LeUxxQGd+BEKq8/0Z9qsORu/d/O04qUwO RsH3Fv0VKnlD+utAh8erCy/dHPExjfjj5XYgfAzXmyLPyzokoEagX7myB371UY2jKM W86soLYMkeH+qVovPSP5h1ike6OktlyeMCKClOzw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Madhuparna Bhowmik , Guenter Roeck , Florian Fainelli , Wim Van Sebroeck , Sasha Levin Subject: [PATCH 4.19 099/191] drivers: watchdog: rdc321x_wdt: Fix race condition bugs Date: Tue, 3 Nov 2020 21:36:31 +0100 Message-Id: <20201103203243.022030764@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201103203232.656475008@linuxfoundation.org> References: <20201103203232.656475008@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: Madhuparna Bhowmik [ Upstream commit 4b2e7f99cdd314263c9d172bc17193b8b6bba463 ] In rdc321x_wdt_probe(), rdc321x_wdt_device.queue is initialized after misc_register(), hence if ioctl is called before its initialization which can call rdc321x_wdt_start() function, it will see an uninitialized value of rdc321x_wdt_device.queue, hence initialize it before misc_register(). Also, rdc321x_wdt_device.default_ticks is accessed in reset() function called from write callback, thus initialize it before misc_register(). Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Madhuparna Bhowmik Reviewed-by: Guenter Roeck Reviewed-by: Florian Fainelli Link: https://lore.kernel.org/r/20200807112902.28764-1-madhuparnabhowmik10@gmail.com Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck Signed-off-by: Sasha Levin --- drivers/watchdog/rdc321x_wdt.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/watchdog/rdc321x_wdt.c b/drivers/watchdog/rdc321x_wdt.c index a281aa84bfb14..4c3b4ea4e17f5 100644 --- a/drivers/watchdog/rdc321x_wdt.c +++ b/drivers/watchdog/rdc321x_wdt.c @@ -244,6 +244,8 @@ static int rdc321x_wdt_probe(struct platform_device *pdev) rdc321x_wdt_device.sb_pdev = pdata->sb_pdev; rdc321x_wdt_device.base_reg = r->start; + rdc321x_wdt_device.queue = 0; + rdc321x_wdt_device.default_ticks = ticks; err = misc_register(&rdc321x_wdt_misc); if (err < 0) { @@ -258,14 +260,11 @@ static int rdc321x_wdt_probe(struct platform_device *pdev) rdc321x_wdt_device.base_reg, RDC_WDT_RST); init_completion(&rdc321x_wdt_device.stop); - rdc321x_wdt_device.queue = 0; clear_bit(0, &rdc321x_wdt_device.inuse); timer_setup(&rdc321x_wdt_device.timer, rdc321x_wdt_trigger, 0); - rdc321x_wdt_device.default_ticks = ticks; - dev_info(&pdev->dev, "watchdog init success\n"); return 0; -- 2.27.0