linux-kernel - Re: [PATCH] ns2: Fix off by one bugs in ns2_pinmux

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Date:   Wed, 2 Oct 2019 13:06:52 -0700
From:   Scott Branden <scott.branden@...adcom.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Ray Jui <rjui@...adcom.com>,
        Yendapally Reddy Dhananjaya Reddy 
        <yendapally.reddy@...adcom.com>
Cc:     Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] ns2: Fix off by one bugs in ns2_pinmux_enable()

thanks for fix.

On 2019-09-26 1:14 a.m., Dan Carpenter wrote:
> The pinctrl->functions[] array has pinctrl->num_functions elements and
> the pinctrl->groups[] array is the same way.  These are set in
> ns2_pinmux_probe().  So the > comparisons should be >= so that we don't
> read one element beyond the end of the array.
>
> Fixes: b5aa1006e4a9 ("pinctrl: ns2: add pinmux driver support for Broadcom NS2 SoC")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Scott Branden <scott.branden@...adcom.com>
> ---
>   drivers/pinctrl/bcm/pinctrl-ns2-mux.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pinctrl/bcm/pinctrl-ns2-mux.c b/drivers/pinctrl/bcm/pinctrl-ns2-mux.c
> index 2bf6af7df7d9..9fabc451550e 100644
> --- a/drivers/pinctrl/bcm/pinctrl-ns2-mux.c
> +++ b/drivers/pinctrl/bcm/pinctrl-ns2-mux.c
> @@ -640,8 +640,8 @@ static int ns2_pinmux_enable(struct pinctrl_dev *pctrl_dev,
>   	const struct ns2_pin_function *func;
>   	const struct ns2_pin_group *grp;
>   
> -	if (grp_select > pinctrl->num_groups ||
> -		func_select > pinctrl->num_functions)
> +	if (grp_select >= pinctrl->num_groups ||
> +		func_select >= pinctrl->num_functions)
>   		return -EINVAL;
>   
>   	func = &pinctrl->functions[func_select];