From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 D74151BE223; Tue, 2 Jul 2024 17:26:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719941176; cv=none; b=iiPwO1tGahwlN8gYu3zwJ65n7KdSp0gZlUBw2U16+pNDZjKkoNDNuoBdBttRVO/Bt6i9CUilNMEZLM2bGZN+U2uvhomoI9cukGliXDlNKo0eYkrkNlgUz566ovDqhar6bWffcqH//6pIIFqoQPxLHZj01jFf2rtzgNO9c7UtFAk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719941176; c=relaxed/simple; bh=nY0X2K5NZcoCXMH3I4H9r1PMC5Y22lBKyxmKeYwAlzo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=p8q34OyP2XwZQ0BGjOgH4WoWOnZYdn9DcxTmQNSKL6FRDyF1h9fPKWWfQGQ7+YPEH2lH140E8NqdjTr9nP8e39bSxTep9vUApUKJf21g1L0D4pV57hIUkA90Y3GNheBOd8v0F5lI8VtgcpM2z73gp5t0WUbeZFmcBX1ijzjQAvo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=qV3YQMue; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="qV3YQMue" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BFBC0C4AF0A; Tue, 2 Jul 2024 17:26:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1719941176; bh=nY0X2K5NZcoCXMH3I4H9r1PMC5Y22lBKyxmKeYwAlzo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qV3YQMuerVQBcPhth9NqgfaZqa2sQKjxOnzs6kWMSjJW6bITg6Wdeo5y6xhIcY7Sq K0g6q3+HjWIU6mBI3mpWAPTtIJKe8h2lyKtVrcKSnxNR14hV+uLtEjjYroX5fiuT+a c0iqIFHTWzIiB/KKCrJy2p23tmxTP+erKoEw3VMY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Trevor Gamblin , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= Subject: [PATCH 6.6 151/163] pwm: stm32: Refuse too small period requests Date: Tue, 2 Jul 2024 19:04:25 +0200 Message-ID: <20240702170238.778033678@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240702170233.048122282@linuxfoundation.org> References: <20240702170233.048122282@linuxfoundation.org> User-Agent: quilt/0.67 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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Uwe Kleine-König commit c45fcf46ca2368dafe7e5c513a711a6f0f974308 upstream. If period_ns is small, prd might well become 0. Catch that case because otherwise with regmap_write(priv->regmap, TIM_ARR, prd - 1); a few lines down quite a big period is configured. Fixes: 7edf7369205b ("pwm: Add driver for STM32 plaftorm") Cc: stable@vger.kernel.org Reviewed-by: Trevor Gamblin Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/b86f62f099983646f97eeb6bfc0117bb2d0c340d.1718979150.git.u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/pwm/pwm-stm32.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/pwm/pwm-stm32.c +++ b/drivers/pwm/pwm-stm32.c @@ -344,6 +344,9 @@ static int stm32_pwm_config(struct stm32 prd = div; + if (!prd) + return -EINVAL; + if (prescaler > MAX_TIM_PSC) return -EINVAL;