linux-kernel - Re: [PATCH net 1/2] net: dsa: realtek: fix out-of-bounds access

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Message-ID: <20230322112151.04f12a8e@kernel.org>
Date:   Wed, 22 Mar 2023 11:21:51 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Luiz Angelo Daros de Luca <luizluca@...il.com>,
        "David S. Miller" <davem@...emloft.net>, kernel@...gutronix.de,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 1/2] net: dsa: realtek: fix out-of-bounds access

On Wed, 22 Mar 2023 16:51:00 +0100 Ahmad Fatoum wrote:
> On 17.03.23 05:07, Jakub Kicinski wrote:
> > On Wed, 15 Mar 2023 14:09:15 +0100 Ahmad Fatoum wrote:  
> >> -	priv = devm_kzalloc(&mdiodev->dev, sizeof(*priv), GFP_KERNEL);
> >> +	priv = devm_kzalloc(&mdiodev->dev, sizeof(*priv) + var->chip_data_sz, GFP_KERNEL);  
> > 
> > size_add() ?
> > Otherwise some static checker is going to soon send us a patch saying
> > this can overflow. Let's save ourselves the hassle.  
> 
> The exact same line is already in realtek-smi. Would you prefer I send
> a follow-up patch for net-next which switches over both files to size_add
> or should I send a v2?

We can leave the existing code be, but use the helper in the new code
for v2