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Date: Mon, 19 Mar 2018 15:38:51 +0100
From: Lukas Wunner <lukas@...ner.de>
To: Laura Abbott <labbott@...hat.com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
Kees Cook <keescook@...omium.org>, linux-gpio@...r.kernel.org,
linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com,
Mathias Duckeck <m.duckeck@...bus.de>
Subject: Re: [PATCHv2 2/4] gpio: Remove VLA from MAX3191X driver
On Thu, Mar 15, 2018 at 11:00:28AM -0700, Laura Abbott wrote:
>
> The new challenge is to remove VLAs from the kernel
> (see https://lkml.org/lkml/2018/3/7/621)
>
> This patch replaces several a VLA with an appropriate call to
> kmalloc_array.
>
> Signed-off-by: Laura Abbott <labbott@...hat.com>
Reviewed-and-tested-by: Lukas Wunner <lukas@...ner.de>
This one isn't a hotpath, so the kmalloc overhead is negligible.
Did a quick test on a single-chip MAX31913 with no apparent issues.
> ---
> v2: No changes
> ---
> drivers/gpio/gpio-max3191x.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/gpio-max3191x.c b/drivers/gpio/gpio-max3191x.c
> index f74b1072e84b..b5b9cb1fda50 100644
> --- a/drivers/gpio/gpio-max3191x.c
> +++ b/drivers/gpio/gpio-max3191x.c
> @@ -315,12 +315,17 @@ static void gpiod_set_array_single_value_cansleep(unsigned int ndescs,
> struct gpio_desc **desc,
> int value)
> {
> - int i, values[ndescs];
> + int i, *values;
> +
> + values = kmalloc_array(ndescs, sizeof(*values), GFP_KERNEL);
> + if (!values)
> + return;
>
> for (i = 0; i < ndescs; i++)
> values[i] = value;
>
> gpiod_set_array_value_cansleep(ndescs, desc, values);
> + kfree(values);
> }
>
> static struct gpio_descs *devm_gpiod_get_array_optional_count(
> --
> 2.14.3
>
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