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=1794061406; b=bP5HWf2h9OIcXYPprcEJVhKhzqfE0CeoZ7i+Wg5jYrGd1H3rdIeLJqegGrN9KYMsFRDC +prLAqovBCuhdRA9krxYWzRzJNlCJDL/DI2IvWxhN+Msfk0ViEf6W/3DHCRYiBxOa+tMl kIhvYJV8/dYPFx6xvNpVs0qYfXXseKccHw/mT97qhDldBcTd19qh/XGtHheocrrjcEEtc sYpqli6tPKJJjPC2Y3i3/m0ReuUDkZFInwQAoDtvxZEnKReyn389TkB6xH9WOOjbqdy6c tz+C26VdzYyhJHscB/sryGH/c6/PejU7klDPIWQ7eUfHSLS6pJQEbgOTtYmT9/ChwhQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794061406; 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=Re0iO9/8tPHV7etPxUWHd6Hgq0hxkn7NCX+I4Uzi5LI=; b=uAxkw64z7fDFWIwJ9i+oWCogoUsA76ovlsT298FglWh2Ak+3jHKQVgV7nDZ026q5p9C8 MPlHilZPKMx6KcUHhEPqOhzQwhFbhCf8MfOq4oMHKW7wKxVMV29UsvtYJulM7OtnpRvVO 8obX0TIZurVq9r2CMUe3PNVBKQV7Z6yQF0ZfxJyu1FUo9RMJTMcdCRnS9PW4wGkmmni/s To/19ZR/iDIM2E1Sdo0632Po+0Rs3ep96jsykIkYljcMMEL9r8/GNDwpl1fPVisNwSatf K5RAHL+PLGmqGKHZJJUxviU4IE346W+MyhF7/FnDHljDpr21QlpuyZBHENZjcspT2dw== 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=nDv2IrAN; 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 6669B606A332; Sat, 7 Nov 2026 14:23:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=nDv2IrAN Received: by smtp.kernel.org (Postfix) with ESMTPSA id 10FDC1F0089F; Sat, 7 Nov 2026 14:23:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794061406; bh=Re0iO9/8tPHV7etPxUWHd6Hgq0hxkn7NCX+I4Uzi5LI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=nDv2IrAN2/1ylrIYw9BKzjGBX0p7kf4YQiN+/zCqywrQkGudhZUrGsKTcYKD5AKlW M0Ehkz+6WB03N5lQDIz/yR8iVVUlyb3h9am6Qj5poTMkVpSV6HZ28c2Pz2ROQpbUJw 7bexq49WvF/+trnuBil/Onk6vHKGjE3MazMpKYq4= 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 6.12 0523/1536] watchdog: rzv2h: Avoid division by zero Date: Sat, 7 Nov 2026 08:42:19 -0500 Message-ID: <20261107135012.115519729@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134957.653319350@linuxfoundation.org> References: <20261107134957.653319350@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tzung-Bi Shih [ Upstream commit 6274281c41efa8dd1aa5234c59ad904ff89d7af4 ] 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: Sasha Levin --- drivers/watchdog/rzv2h_wdt.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/watchdog/rzv2h_wdt.c b/drivers/watchdog/rzv2h_wdt.c index 7df8b8e392410..c29c94f0b6295 100644 --- a/drivers/watchdog/rzv2h_wdt.c +++ b/drivers/watchdog/rzv2h_wdt.c @@ -221,6 +221,7 @@ static int rzv2h_wdt_probe(struct platform_device *pdev) 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); @@ -257,8 +258,12 @@ static int rzv2h_wdt_probe(struct platform_device *pdev) 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(&pdev->dev); -- 2.53.0