linux-kernel - Re: [PATCH v3 net-next] mdio-mux-gpio: Remove VLA usage

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Date:   Mon, 25 Jun 2018 15:23:05 -0700
From:   Joe Perches <joe@...ches.com>
To:     Kees Cook <keescook@...omium.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     linux-kernel@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        netdev@...r.kernel.org
Subject: Re: [PATCH v3 net-next] mdio-mux-gpio: Remove VLA usage

On Mon, 2018-06-25 at 15:09 -0700, Kees Cook wrote:
> In the quest to remove all stack VLA usage from the kernel[1], this
> allocates the values buffer during the callback instead of putting it
> on the stack.

[]

> diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
[]
> @@ -44,15 +44,21 @@ static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
>  static int mdio_mux_gpio_probe(struct platform_device *pdev)
>  {
[]
> +	s = devm_kzalloc(&pdev->dev, sizeof(*s->values) * gpios->ndescs +
> +				     sizeof(*s), GFP_KERNEL);

Isn't this supposed to use your new struct_size()