[PATCH v2] pinctrl: single: check pinctrl_spec.args_count > 3

[Tony Lindgren]

* Drew Fustini <drew at beagleboard.org> [200913 23:18]:
> pinctrl_spec.args_count can either be 2 when #pinctrl-cells = 1 or
> 3 when #pinctrl-cells = 2.
> 
> There is currently only a check to make sure that it is 2 or greater.
> This patch adds a check to make sure it is not greater than 3.
> 
> Fixes: a13395418888 ("pinctrl: single: parse #pinctrl-cells = 2")
> Reported-by: Trent Piepho <tpiepho at gmail.com>
> Link: https://lore.kernel.org/linux-omap/3139716.CMS8C0sQ7x@zen.local/
> Signed-off-by: Drew Fustini <drew at beagleboard.org>
> ---
> v2 change:
> - this is a fix to my prior email where I referred to #pinctrl-cells
>   exceeding 3 which is incorrect.  It is pinctrl_spec.args_count which
>   must be greater than 2 (when #pinctrl-cells = 1) and less than 3 (when
>   #pinctrl-cells = 2)

Acked-by: Tony Lindgren <tony at atomide.com>

> https://lore.kernel.org/linux-omap/20200913210825.2022552-1-drew@beagleboard.org/
> 
> 
>  drivers/pinctrl/pinctrl-single.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
> index efe41abc5d47..5cbf0e55087c 100644
> --- a/drivers/pinctrl/pinctrl-single.c
> +++ b/drivers/pinctrl/pinctrl-single.c
> @@ -1014,7 +1014,7 @@ static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
>  		if (res)
>  			return res;
>  
> -		if (pinctrl_spec.args_count < 2) {
> +		if (pinctrl_spec.args_count < 2 || pinctrl_spec.args_count > 3) {
>  			dev_err(pcs->dev, "invalid args_count for spec: %i\n",
>  				pinctrl_spec.args_count);
>  			break;
> -- 
> 2.25.1
>