linux-kernel - Re: [PATCH] net: phy: mdio-bcm-unimac: Cast denominator to unsigned long to avoid overflow

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Date: Thu, 7 Mar 2024 12:21:26 -0800
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Daniil Dulov <d.dulov@...ddin.ru>, Doug Berger <opendmb@...il.com>
Cc: Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, Andrew Lunn <andrew@...n.ch>,
 Heiner Kallweit <hkallweit1@...il.com>, Russell King
 <linux@...linux.org.uk>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH] net: phy: mdio-bcm-unimac: Cast denominator to unsigned
 long to avoid overflow

On 3/7/2024 5:19 AM, Daniil Dulov wrote:
> The expression priv->clk_freq * 2 can lead to overflow that will cause
> a division by zero. So, let's cast it to unsigned long to avoid it.

It will not in real life because the maximum clock frequency is 250MHz, 
but it also does not hurt.

> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: b78ac6ecd1b6 ("net: phy: mdio-bcm-unimac: Allow configuring MDIO clock divider")
> Signed-off-by: Daniil Dulov <d.dulov@...ddin.ru>

Acked-by: Florian Fainelli <florian.fainelli@...adcom.com>
-- 
Florian

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