From mboxrd@z Thu Jan 1 00:00:00 1970 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 BDBD036921B; Wed, 30 Sep 2026 16:21:45 +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=1790785314; cv=none; b=Hld4M5+7HX6dqoaxA0R2/hdQ5J+XnwDx+s48CmyOKs3ciLLmoPuZ+efuQdqXDClVAD90j4LqKHl2PbGiBSlsGxoffW0nrhY2EZfaF12BK4NH5vpDUFk5dZXJQsuhWL7NfGrwk8u7rAQMf7bpnMZCaEBf5hrzUr4kfCtUTHswAtU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790785314; c=relaxed/simple; bh=zMxDDfCBRq2Khgpprgna9xsy6UBQkGGHt9hU3Jegl1w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GDbecRF7cLtMn/XwKTFZ04v9P0kLT5deSi+U5GZX/A/5ZCJC6B4pvKxD8Mw5l7NT+Qq0IgsOJ7TWmqhYru4R2bdGj1g5bYeQ6e6w2MU4Mv/eP6h+LWTESXiZdfjU4OfpCG7smbkukDAn63YS827Neanu+5OzCrxNW9w7dySUIBQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=jrn8lUAi; 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="jrn8lUAi" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B8E331F00898; Wed, 30 Sep 2026 16:21:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790785302; bh=ZYkFLfZFGoCpMgQmgMqzhz7yXh/b/O4a9lvAzRwrgSw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=jrn8lUAiWz3iyvNxwzW3pYZHCSbIJrhrIfthTALh5HA2/S/aIbx2NYCL/y/pqHGxf dinw1waUno/pz/sCZEmWrQFToTjWbrE5/ar3Rik9g7fq1xyewlkBgs4rlwdnGaCSfA hvFH2mW+P4U0amjyGkQZgKp+9jDzEscK/7II7RrU= 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 6.1 462/982] watchdog: msc313e: Avoid division by zero Date: Wed, 30 Sep 2026 17:19:58 +0200 Message-ID: <20260930152426.709804102@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152416.775402466@linuxfoundation.org> References: <20260930152416.775402466@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 6.1-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