linux-kernel - Re: [PATCH v2] pinctrl: single: fix pinctrl_spec.args

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Date:   Thu, 1 Oct 2020 10:31:59 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Drew Fustini <drew@...gleboard.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jason Kridner <jkridner@...gleboard.org>,
        Robert Nelson <robertcnelson@...il.com>,
        Trent Piepho <tpiepho@...il.com>,
        Christina Quast <cquast@...overdisplays.com>,
        linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v2] pinctrl: single: fix pinctrl_spec.args_count bounds
 check

* Drew Fustini <drew@...gleboard.org> [200930 17:51]:
> The property #pinctrl-cells can either be 1 or 2:
> 
> - if #pinctrl-cells = <1>, then pinctrl_spec.args_count = 2
> - if #pinctrl-cells = <2>, then pinctrl_spec.args_count = 3
> 
> All other values of pinctrl_spec.args_count are incorrect.  This fix
> checks the upper bound instead of just the lower bound.
> 
> Fixes: a13395418888 ("pinctrl: single: parse #pinctrl-cells = 2")
> Reported-by: Trent Piepho <tpiepho@...il.com>
> Link: https://lore.kernel.org/linux-omap/3139716.CMS8C0sQ7x@zen.local/
> Signed-off-by: Drew Fustini <drew@...gleboard.org>
> ---
> v2 change:
> - correct the description as I had previously been mistakenly using the
>   term #pinctrl-cells instead of pinctrl_spec.args_count

Acked-by: Tony Lindgren <tony@...mide.com>

>  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
>