[PATCH] leds: mt6360: Annotate struct mt6360_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 mt6360_priv.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Pavel Machek <pavel at ucw.cz>
> Cc: Lee Jones <lee at kernel.org>
> Cc: Matthias Brugger <matthias.bgg at gmail.com>
> Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
> Cc: Gene Chen <gene_chen at richtek.com>
> Cc: Jacek Anaszewski <jacek.anaszewski at gmail.com>
> Cc: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
> Cc: linux-leds at vger.kernel.org
> Cc: linux-arm-kernel at lists.infradead.org
> Cc: linux-mediatek at lists.infradead.org
> Signed-off-by: Kees Cook <keescook at chromium.org>

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

Thanks
-- 
Gustavo

> ---
>   drivers/leds/flash/leds-mt6360.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/leds/flash/leds-mt6360.c b/drivers/leds/flash/leds-mt6360.c
> index 1af6c5898343..b70dc689b33f 100644
> --- a/drivers/leds/flash/leds-mt6360.c
> +++ b/drivers/leds/flash/leds-mt6360.c
> @@ -91,7 +91,7 @@ struct mt6360_priv {
>   	unsigned int fled_torch_used;
>   	unsigned int leds_active;
>   	unsigned int leds_count;
> -	struct mt6360_led leds[];
> +	struct mt6360_led leds[] __counted_by(leds_count);
>   };
>   
>   static int mt6360_mc_brightness_set(struct led_classdev *lcdev,