linux-kernel - Re: [PATCH] hwmon: (peci/cputemp) Fix off-by-one in coretemp

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Date:   Fri, 3 Feb 2023 07:27:39 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Zev Weiss <zev@...ilderbeest.net>
Cc:     Iwona Winiarska <iwona.winiarska@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>,
        Jean Delvare <jdelvare@...e.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        openbmc@...ts.ozlabs.org, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...nel.org
Subject: Re: [PATCH] hwmon: (peci/cputemp) Fix off-by-one in coretemp_label
 allocation

On Wed, Feb 01, 2023 at 06:18:25PM -0800, Zev Weiss wrote:
> The find_last_bit() call produces the index of the highest-numbered
> core in core_mask; because cores are numbered from zero, the number of
> elements we need to allocate is one more than that.
> 
> Signed-off-by: Zev Weiss <zev@...ilderbeest.net>
> Cc: stable@...nel.org # v5.18
> Fixes: bf3608f338e9 ("hwmon: peci: Add cputemp driver")
> Reviewed-by: Iwona Winiarska <iwona.winiarska@...el.com>

Applied.

Thanks,
Guenter

> ---
>  drivers/hwmon/peci/cputemp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/peci/cputemp.c b/drivers/hwmon/peci/cputemp.c
> index ec9851daf2e8..f13cc4170f58 100644
> --- a/drivers/hwmon/peci/cputemp.c
> +++ b/drivers/hwmon/peci/cputemp.c
> @@ -431,7 +431,7 @@ static int create_temp_label(struct peci_cputemp *priv)
>  	unsigned long core_max = find_last_bit(priv->core_mask, CORE_NUMS_MAX);
>  	int i;
>  
> -	priv->coretemp_label = devm_kzalloc(priv->dev, core_max * sizeof(char *), GFP_KERNEL);
> +	priv->coretemp_label = devm_kzalloc(priv->dev, (core_max + 1) * sizeof(char *), GFP_KERNEL);
>  	if (!priv->coretemp_label)
>  		return -ENOMEM;
>