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 E73A83F5BFC; Wed, 30 Sep 2026 18:05:53 +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=1790791555; cv=none; b=rZOp9djgARwYEWqlQ9jMlYN4FM5g5F2lPFqSxnII6MEz8hNs4hLaJZZxYcp9Q67lGx9UhxUtQG/NSPt7JBszedqI/v6klGoABQVqY9zoG21AHoyQkxc3czPhlhOmxl/jDBLt2Ebe4yH5is2BBAZ3vNSgT6wNk0LTcGi7ke7zjLM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790791555; c=relaxed/simple; bh=uqF3vU/+Ylt26s/jNVoUTwidQMCpo7KQkJK61Ix1gQw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ovg8eAv5ttOjPf7Cgqlqd+hHtma5nTmZOGuSr+vBkmjuIZwiTBNcBmQiTrzhTV0OD8Eh/vgIm4BKTcIFPqjp4rZpwILn2VN3qzApxxvgBoDe11tnbhlPZeJPv0fiiIKYFgAxMtY4TpgZDeJvLE12N1ijnpILR3YloYgJStEceEI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=zFoQSCtO; 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="zFoQSCtO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4EBB01F000FF; Wed, 30 Sep 2026 18:05:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790791553; bh=XxNj7Jn6CqMidwiQBXPM/o/gEjP3kpf+BEdeuxeGLYE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=zFoQSCtO8/3jI6WUW4Ap1I41Bsi9kNf6gtd13w08NciG7wk7c0rJL1SmSoAbSqXyI rKTUFcCAncXBO6rUEMlpJqOVY92VNmwAhA2Gno7PON3qtoMk6Fgyu4oBDYp4ty03N+ 9aMyxzdzsBruChmqLhqKD6hW0WvCI0l4HkPsTRpE= 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 5.15 343/752] watchdog: msc313e: Avoid division by zero Date: Wed, 30 Sep 2026 17:23:33 +0200 Message-ID: <20260930152405.714409428@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152358.131179731@linuxfoundation.org> References: <20260930152358.131179731@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 5.15-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 3bc7fceffa0bd..5dcf3f85ba842 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; watchdog_set_drvdata(&priv->wdev, priv); -- 2.53.0