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 4B22B493D5A for ; Tue, 22 Sep 2026 18:31:05 +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=1790101866; cv=none; b=l2s7tdMIqoInDWBQxplgPrxEmaSPrBoq2N17AKv5gmj6xOd4SXDiwXQe1qyZLfSWRAeO0vU7DGz5nwgJC4VkNg7vG+nO9KXEG/zF94L7TbJNTtu6hFc8iZy7K+4sjshDe0RoTrQaxQUDhw8P6STFlCur/jMcGsGPUOb4wZP0Ssg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790101866; c=relaxed/simple; bh=eyLcNzaw4//dQyWkWIqguwPPadmDrqec5ubbhFUO0ek=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=k1S3td5zJ5JNwslV6FYue89MY46RLmirZay9JuHs3hiBQ77CG/pT1527Un67WI32ww5ShPdVWr//exQRbF2oUSYI/KEPaeSKW8fMcTVLxp/c6v2WzIxQ2sLPgOcUS7doraW8jjm0ZxPw28FL6kgkgQY/MMygkBgkKZn/aYmCkqo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UTSsu9gf; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="UTSsu9gf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B1CF41F00899; Tue, 22 Sep 2026 18:31:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790101865; bh=qDheX2XfvdDa4+fyFQ1df1evidZ8WtkETw9p4eY9kMM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=UTSsu9gfO6rhPvpy2dsu+8e+iZkDNWHolda58V4y/Oqu7ef28HMIVzXAvAFEEql+r kHIg2c4Lg6HdRgnIzIXNJeAGva9WyWZ6hzn5VYTthi75DALYM0HPYrDWHfqW3U09pa 5b9Duu8Oo3sxg0XKZlEUNlibPJPfiR9N41iKA6TfE2gq8rWLq3RHWHal2tu5i2LWpH x6ATjJxcoU0J7URh9aTVEcwOMqC7GvQkftHdQTp4mS4yvKdKzcGnB6MzdQr5n82cM5 WiwNyenNALS2RKh0gHEZqFg+9DkE0SThfNtKCgmzQ9VjQH9AFwtkUSxHRX2K80e7Ev 3IbfHdmTPGANg== From: Sasha Levin To: stable@vger.kernel.org Cc: Tzung-Bi Shih , Guenter Roeck , Sasha Levin Subject: [PATCH 5.10.y 2/2] watchdog: rtd119x: Avoid division by zero Date: Tue, 22 Sep 2026 14:31:02 -0400 Message-ID: <20260922183102.3660424-2-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260922183102.3660424-1-sashal@kernel.org> References: <2026092230-dipper-mute-1a50@gregkh> <20260922183102.3660424-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Tzung-Bi Shih [ Upstream commit 5af7d2cbd20f893def03c8310a460ade66a5d822 ] clk_get_rate() could return 0. Avoid a division by zero panic. Fixes: 2bdf6acbfead ("watchdog: Add Realtek RTD1295") Cc: stable@vger.kernel.org Signed-off-by: Tzung-Bi Shih Link: https://patch.msgid.link/20260913064851.8239-3-tzungbi@kernel.org Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin --- drivers/watchdog/rtd119x_wdt.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/watchdog/rtd119x_wdt.c b/drivers/watchdog/rtd119x_wdt.c index 95c8d7abce42e..e963be4df8c4e 100644 --- a/drivers/watchdog/rtd119x_wdt.c +++ b/drivers/watchdog/rtd119x_wdt.c @@ -98,6 +98,7 @@ static int rtd119x_wdt_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct rtd119x_watchdog_device *data; + unsigned long rate; data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); if (!data) @@ -111,10 +112,14 @@ static int rtd119x_wdt_probe(struct platform_device *pdev) if (IS_ERR(data->clk)) return PTR_ERR(data->clk); + rate = clk_get_rate(data->clk); + if (!rate) + return -EINVAL; + data->wdt_dev.info = &rtd119x_wdt_info; data->wdt_dev.ops = &rtd119x_wdt_ops; data->wdt_dev.timeout = 120; - data->wdt_dev.max_timeout = 0xffffffff / clk_get_rate(data->clk); + data->wdt_dev.max_timeout = 0xffffffff / rate; data->wdt_dev.min_timeout = 1; data->wdt_dev.parent = dev; -- 2.53.0