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 93DF13CAE8D; Wed, 30 Sep 2026 19:10:33 +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=1790795434; cv=none; b=baFpADL50eJ2FiqfdtAx/40yPTJaQL7/Ums1gr2XSHjSRU60Ive4BvFDTpMpszzM6H6WRbjtH9KBgnTu0Jrsy3dRzy333ePMX9JvyCLbFDlk2cp0OxT5wucWOR2sR1K5Xn4H6xi8Qtjz04Lz/Aq3pJhSjSYt3jRxKxXZkFS+res= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790795434; c=relaxed/simple; bh=xsqVOFe/53K0AFop5o9OkGkLFWgHviB/Jf4VLl0jsS0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rSpVFaDedsVjwZ94BovHrBO+PocNTxQHWezHJEsguJEPcZ9wejVLqjj7pjStCqFj8MjiYfyXz+E4FVVd2X2DYVhOIK3rg8IP3KDxPiIrNpukK2/enbkBAYo5W9Of/8rNtLg07zwJGPoSkrxqrCqMKW8Jl6do/9srKGQjQk+WoOU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Imeujj2T; 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="Imeujj2T" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CF9FE1F00898; Wed, 30 Sep 2026 19:10:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790795433; bh=77QT2p2DPXz0KSoWBxylPdUX7aTXx5ydX6JsVAN0pSE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Imeujj2THTeFusl23jOzmInd3JnPwzCyNrEnubSp/O7DIFqIukWdldU8pPYXsBioO K5he3SP+lx33s/dwrNhrjReQ5N+PODqqeWxvbTTjqWlm4K9FTe3bJGkkcVVPmM1VoG 4JIGDKPcWUmbOufoFTTRlUdB5qX7bSZ6eNONj3fA= 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 6.6 0558/1193] watchdog: msc313e: Avoid division by zero Date: Wed, 30 Sep 2026 17:20:42 +0200 Message-ID: <20260930152446.636332294@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152434.301151190@linuxfoundation.org> References: <20260930152434.301151190@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 6.6-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