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 25EAF492E5C; Wed, 23 Sep 2026 14:53:29 +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=1790175211; cv=none; b=iyrfMo4OGkTuxrDS3D/UB89DXoSOTnnk2mfs46JHRmOhwmhZh+EqRf0rbdT58vC0A/RRzvT5mXf18IYm96w5kY4LOTX9sELO8Trzq6QPdbDIXsi5+q7EcfeQjO6qGVhIgUtd4DhaYVS4y92JaYn0YHFadG2QZ59wwXJJdLbnDDg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790175211; c=relaxed/simple; bh=qL5i0fdrlmIeS2J9xZGp/83q+h04F+46z8KGiZAmJyI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=s6V0tU82Gu0aqALvhJtSHZXFKxVRqF/L75RRgpl08dNE5Q+IlfREKdXp3x/KEEMSE3nHfKGvJkhnEoAa+CsyeCSaIsx6//QRfdoqDHMuJ8OrgwEqWIh3C6dqNUGQEjrdq89thmsmZFbuDO13nZ4jVN2jbPVAU28rOxZ7taHyEgI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=EJXLEU0C; 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="EJXLEU0C" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 22C061F000FF; Wed, 23 Sep 2026 14:53:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790175209; bh=PtoOqfuVzsc41K4YwTsrCl6Qm1auySlWRsWQJCd0qyc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=EJXLEU0CpExZwnH/KbmdVFKb7JYFIh+uNonv6nGdGsnVs56M2yeADYebs3mwl7KU9 mbSv5zFkiWrFTRojpMv5/4Rl85iKs+MsMV/gGSg8mMo5jAB3PC7x9AzE6w6+s1SesC E+4sGGpzuLRoo83FXpcVMf6SpJfaepfowcgEeUus= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tzung-Bi Shih , Guenter Roeck Subject: [PATCH 6.18 320/398] watchdog: rzv2h: Avoid division by zero Date: Wed, 23 Sep 2026 16:06:34 +0200 Message-ID: <20260923140651.714434993@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260923140643.441954610@linuxfoundation.org> References: <20260923140643.441954610@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 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tzung-Bi Shih commit 6274281c41efa8dd1aa5234c59ad904ff89d7af4 upstream. clk_get_rate() could return 0. Avoid a division by zero panic. Fixes: f6febd0a30b6 ("watchdog: Add Watchdog Timer driver for RZ/V2H(P)") Cc: stable@vger.kernel.org Signed-off-by: Tzung-Bi Shih Link: https://patch.msgid.link/20260913064851.8239-4-tzungbi@kernel.org Signed-off-by: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- drivers/watchdog/rzv2h_wdt.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/drivers/watchdog/rzv2h_wdt.c +++ b/drivers/watchdog/rzv2h_wdt.c @@ -280,6 +280,7 @@ static int rzv2h_wdt_probe(struct platfo struct device *dev = &pdev->dev; struct rzv2h_wdt_priv *priv; struct clk *count_clk; + unsigned long rate; int ret; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); @@ -316,8 +317,12 @@ static int rzv2h_wdt_probe(struct platfo return dev_err_probe(dev, -EINVAL, "Invalid count source\n"); } + rate = clk_get_rate(count_clk); + if (!rate) + return dev_err_probe(dev, -EINVAL, "Invalid clock rate\n"); + priv->wdev.max_hw_heartbeat_ms = (MILLI * priv->of_data->timeout_cycles * - priv->of_data->cks_div) / clk_get_rate(count_clk); + priv->of_data->cks_div) / rate; dev_dbg(dev, "max hw timeout of %dms\n", priv->wdev.max_hw_heartbeat_ms); ret = devm_pm_runtime_enable(dev);