Re: [PATCH] leds: cr0014114: Annotate struct cr0014114 with __counted_by

["Gustavo A. R. Silva" <gustavo@embeddedor.com>]

On 9/15/23 14:09, 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 cr0014114.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Pavel Machek <pavel@ucw.cz>
> Cc: Lee Jones <lee@kernel.org>
> Cc: linux-leds@vger.kernel.org
> Signed-off-by: Kees Cook <keescook@chromium.org>

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

Thanks
-- 
Gustavo

> ---
>   drivers/leds/leds-cr0014114.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/leds/leds-cr0014114.c b/drivers/leds/leds-cr0014114.c
> index b33bca397ea6..c9914fc51f20 100644
> --- a/drivers/leds/leds-cr0014114.c
> +++ b/drivers/leds/leds-cr0014114.c
> @@ -56,7 +56,7 @@ struct cr0014114 {
>   	struct spi_device	*spi;
>   	u8			*buf;
>   	unsigned long		delay;
> -	struct cr0014114_led	leds[];
> +	struct cr0014114_led	leds[] __counted_by(count);
>   };
>   
>   static void cr0014114_calc_crc(u8 *buf, const size_t len)