Re: [PATCH] leds: gpio: Annotate struct gpio_leds_priv with __counted_by

[Gustavo A. R. Silva]

On 9/15/23 14:10, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
> (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
>
> As found with Coccinelle[1], add __counted_by for struct gpio_leds_priv.
>
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
>
> Cc: Pavel Machek <pavel@xxxxxx>
> Cc: Lee Jones <lee@xxxxxxxxxx>
> Cc: linux-leds@xxxxxxxxxxxxxxx
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>

Reviewed-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>

Thanks
--
Gustavo

> ---
>   drivers/leds/leds-gpio.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
> index 7bfe40a6bfdd..a6597f0f3eb4 100644
> --- a/drivers/leds/leds-gpio.c
> +++ b/drivers/leds/leds-gpio.c
> @@ -142,7 +142,7 @@ static int create_gpio_led(const struct gpio_led *template,
>   
>   struct gpio_leds_priv {
>   	int num_leds;
> -	struct gpio_led_data leds[];
> +	struct gpio_led_data leds[] __counted_by(num_leds);
>   };
>   
>   static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)