Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0FD314D17A5; Thu, 17 Sep 2026 17:26:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789666007; cv=none; b=qRCNdM1MA3CtHVAZeBlvB84fogwr1UhQYuqsO7r1sxDdOf8xz+o2xGdRGq7xGBkxVxjBNm/zRDRCzSX89LEMIERgY7uPckbHO/ZINCvUyMsfooU2Hf9LPFVfBPtxwcmj1oSs0Yt82u0DFo1ZtoIrbnqGCalTYB0QGOaqMJYH5LA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789666007; c=relaxed/simple; bh=Xopl5PZg5uaZEoayUn111s/phQppL4Nm3xluZrTtJrw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nv3Kb80yoBdj5y0cMDwaoCOv9aXil7cQ3WIO0Ku0wP2jg3bqVB1AUyAPTQC6zxMLYdWWjUCf3b31L21DKV2rnxu3gWBTM1/EQiGJemHES10oAuSkUlMm2UGjv8HrdQNu8ERRJ+P8i82edccxJqwrgFdAdUVtubnTT3amRGy0oRQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=iwH77tCr; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="iwH77tCr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 53C5B1F000FF; Thu, 17 Sep 2026 17:26:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789666005; bh=vx4hbLAQO45fYV6274aUE5bocgAeeasGFnyG38Q34gw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=iwH77tCrlG+h33Wi8cAnApiyLSEL4zEALUbfIpoYfVW0FJ/MS7tgL1ycScuc+RNMw Q3FeGzgfgFcCRhMBMtiMHxFH3EIS5wl/8uXyGeLUQXV/7qoeFuqIZ3nbHzDRSugoYA bsXaAFiIFxArNge9KcIdxiaHjaad2s+Gez6f2baY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tzung-Bi Shih , Guenter Roeck , Sasha Levin Subject: [PATCH 6.18 0892/1250] watchdog: msc313e: Avoid division by zero Date: Thu, 17 Sep 2026 16:11:27 +0100 Message-ID: <20260917151616.163114584@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260917151551.901433442@linuxfoundation.org> References: <20260917151551.901433442@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tzung-Bi Shih [ Upstream commit 3c73a37f5e40972ce26d8eeb98e8b938d719b069 ] clk_get_rate() could return 0. Avoid a division by zero panic. Fixes: e9800b799464 ("watchdog: Add Mstar MSC313e WDT driver") Signed-off-by: Tzung-Bi Shih Link: https://patch.msgid.link/20260828161348.13212-3-tzungbi@kernel.org Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin --- drivers/watchdog/msc313e_wdt.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/watchdog/msc313e_wdt.c b/drivers/watchdog/msc313e_wdt.c index 3b62650375628..072bfcea85c24 100644 --- a/drivers/watchdog/msc313e_wdt.c +++ b/drivers/watchdog/msc313e_wdt.c @@ -98,6 +98,7 @@ static int msc313e_wdt_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct msc313e_wdt_priv *priv; + unsigned long rate; priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) @@ -117,7 +118,10 @@ static int msc313e_wdt_probe(struct platform_device *pdev) priv->wdev.ops = &msc313e_wdt_ops, priv->wdev.parent = dev; priv->wdev.min_timeout = MSC313E_WDT_MIN_TIMEOUT; - priv->wdev.max_timeout = U32_MAX / clk_get_rate(priv->clk); + rate = clk_get_rate(priv->clk); + if (!rate) + return -EINVAL; + priv->wdev.max_timeout = U32_MAX / rate; priv->wdev.timeout = MSC313E_WDT_DEFAULT_TIMEOUT; /* If the period is non-zero the WDT is running */ -- 2.53.0