Re: [PATCH] leds: qcom-lpg: Annotate struct lpg_led with __counted_by

[Gustavo A. R. Silva]

On 9/15/23 14:11, 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 lpg_led.
>
> [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: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx>
> Cc: "Uwe Kleine-König" <u.kleine-koenig@xxxxxxxxxxxxxx>
> Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
> Cc: Anjelique Melendez <quic_amelende@xxxxxxxxxxx>
> Cc: linux-leds@xxxxxxxxxxxxxxx
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>

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

Thanks
--
Gustavo

> ---
>   drivers/leds/rgb/leds-qcom-lpg.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/leds/rgb/leds-qcom-lpg.c b/drivers/leds/rgb/leds-qcom-lpg.c
> index df469aaa7e6e..7d93e02a030a 100644
> --- a/drivers/leds/rgb/leds-qcom-lpg.c
> +++ b/drivers/leds/rgb/leds-qcom-lpg.c
> @@ -173,7 +173,7 @@ struct lpg_led {
>   	struct led_classdev_mc mcdev;
>   
>   	unsigned int num_channels;
> -	struct lpg_channel *channels[];
> +	struct lpg_channel *channels[] __counted_by(num_channels);
>   };
>   
>   /**