From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793210652; b=CdSYkilbOhqgH61nU7hMjO3God96+8uz3WfnvLGQgocntn6xUdYewUFgBK10KFDGy3GC ubdg5KKE1rszm2h9d63TlNKw2No9/g9D1W6JhaObPb09/yLlP6+xc8i53YHI0WFw81K1B ljPsoeyAUbmqswpoxW4vaQmwJHufWwD2IAy7Z3UUPaCSyr+F50IMIqPZvBOskQ3uTCc4T GZkRF0J11SDv674WQWNQ1w+lKIGrl8ZE3So41LQdhXNkb5HmaUUnqP0GyjR4ZrBmeRfY/ qhGMwRIuPDBc6bbuXBbF0SdaMeTDci8j73Ysx5+uWVqMsDiQyHB1tV7viWWBXsGTe6Q== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793210652; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=Er0AWsksXYgCaTM/QrTZcep46ZaylcFvvAMeIYj+foQ=; b=qA8D8LS6XebqU1s5BxWTGjYuosp8CBEbpyAnr//kZlWz9RJ/X8zQByYN1pFOGrqY/gSk q/PHjayjbEFd6Sp/vkqHmXVnZs/et3/ZGdx3AOzQvvQ6MbdgEyEop/xfLmMkiIxAsAs92 OdBE1mv8LXeFvfg5fYwR+uk8GtR4Zk7sYmcjlHwKgHb7t5IhOH9K+1CYNKW0Y5nf8NPSl +aq8SnMK5/tyGXPrp8uFUirIzRVZQT4cIlHn9vi/ab+5N0YQvcCHCpzGR5EqvEbV9C0cJ 72ESlGc5dN1qQRqBPyc91nlaQO43xKRO7/Xy8lyTHYhv2hsie1S4UJNKc73nfeVSFZQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=CBc1UJ0P; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 63624606A31D; Wed, 28 Oct 2026 18:04:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=CBc1UJ0P Received: by smtp.kernel.org (Postfix) with ESMTPSA id B10311F01825; Wed, 28 Oct 2026 18:04:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793210652; bh=Er0AWsksXYgCaTM/QrTZcep46ZaylcFvvAMeIYj+foQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=CBc1UJ0PMfD2PLNFn6k808NFzq9oLR1kixOTcUTGAQPs3cparDWPhx7/eQePaNnS4 ebAFYZoeWcXySoP5p97x6DuuCxBr/+wg8/ijpSlCTfpYB8vJH4/JchTKtHh4WTQKGP ieQCgJ2Ll1so7zg8FGlkaMdp3NGZYfNeHCgg4tyw= 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 5.15 101/571] watchdog: rtd119x: Avoid division by zero Date: Wed, 28 Oct 2026 17:54:08 +0100 Message-ID: <20261028170010.418303234@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261028170008.009143722@linuxfoundation.org> References: <20261028170008.009143722@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list 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 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