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SubjectRe: [PATCH] leds: lm3697: Annotate struct lm3697 with __counted_by
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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 lm3697.
>
> [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-lm3697.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/leds/leds-lm3697.c b/drivers/leds/leds-lm3697.c
> index cfb8ac220db6..380d17a58fe9 100644
> --- a/drivers/leds/leds-lm3697.c
> +++ b/drivers/leds/leds-lm3697.c
> @@ -89,7 +89,7 @@ struct lm3697 {
> int bank_cfg;
> int num_banks;
>
> - struct lm3697_led leds[];
> + struct lm3697_led leds[] __counted_by(num_banks);
> };
>
> static const struct reg_default lm3697_reg_defs[] = {

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