Re: [PATCH] soc: imx: imx8m-blk-ctrl: off by one in imx8m_blk_ctrl_xlate()

[Lucas Stach]

Hi Dan,

Am Montag, dem 11.10.2021 um 15:36 +0300 schrieb Dan Carpenter:
> The > comparison should be >= to prevent reading one element beyond the
> end of the array.  The onecell_data->domains[] array is allocated in
> imx8m_blk_ctrl_probe() and it has "onecell_data->num_domains" elements.

Thanks for the patch! I guess this was found via smatch? I should
really make it a habit to use smatch on my submissions...

> Fixes: 5b340e7813d4 ("soc: imx: add i.MX8M blk-ctrl driver")
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>

> ---
>  drivers/soc/imx/imx8m-blk-ctrl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/imx/imx8m-blk-ctrl.c b/drivers/soc/imx/imx8m-blk-ctrl.c
> index e172d295c441..519b3651d1d9 100644
> --- a/drivers/soc/imx/imx8m-blk-ctrl.c
> +++ b/drivers/soc/imx/imx8m-blk-ctrl.c
> @@ -139,7 +139,7 @@ imx8m_blk_ctrl_xlate(struct of_phandle_args *args, void *data)
>  	unsigned int index = args->args[0];
>  
>  	if (args->args_count != 1 ||
> -	    index > onecell_data->num_domains)
> +	    index >= onecell_data->num_domains)
>  		return ERR_PTR(-EINVAL);
>  
>  	return onecell_data->domains[index];