linux-kernel - Re: [PATCH v2 01/16] hwmon: (mr75203) fix VM sensor allocation when "intel,vm-map" not defined

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20220818194008.GA3118944@roeck-us.net>
Date:   Thu, 18 Aug 2022 12:40:08 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Eliav Farber <farbere@...zon.com>
Cc:     jdelvare@...e.com, robh+dt@...nel.org, mark.rutland@....com,
        linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, talel@...zon.com, hhhawa@...zon.com,
        jonnyc@...zon.com, hanochu@...zon.com, ronenk@...zon.com,
        itamark@...zon.com, shellykz@...zon.com, shorer@...zon.com,
        amitlavi@...zon.com, almogbs@...zon.com, dwmw@...zon.co.uk,
        rtanwar@...linear.com
Subject: Re: [PATCH v2 01/16] hwmon: (mr75203) fix VM sensor allocation when
 "intel,vm-map" not defined

On Wed, Aug 17, 2022 at 05:43:06AM +0000, Eliav Farber wrote:
> Fix a bug that in case "intel,vm-map" is missing 'num' is set to 0,
> and no voltage channel infos are allocated.
> 

"intel,vm-map" is listed as required property in moortec,mr75203.yaml.
If it is missing, the probe function should fail.

Guenter

> Signed-off-by: Eliav Farber <farbere@...zon.com>
> ---
>  drivers/hwmon/mr75203.c | 28 ++++++++++++----------------
>  1 file changed, 12 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c
> index 046523d47c29..0e29877a1a9c 100644
> --- a/drivers/hwmon/mr75203.c
> +++ b/drivers/hwmon/mr75203.c
> @@ -580,8 +580,6 @@ static int mr75203_probe(struct platform_device *pdev)
>  	}
>  
>  	if (vm_num) {
> -		u32 num = vm_num;
> -
>  		ret = pvt_get_regmap(pdev, "vm", pvt);
>  		if (ret)
>  			return ret;
> @@ -594,30 +592,28 @@ static int mr75203_probe(struct platform_device *pdev)
>  		ret = device_property_read_u8_array(dev, "intel,vm-map",
>  						    pvt->vm_idx, vm_num);
>  		if (ret) {
> -			num = 0;
> +			/*
> +			 * Incase intel,vm-map property is not defined, we
> +			 * assume incremental channel numbers.
> +			 */
> +			for (i = 0; i < vm_num; i++)
> +				pvt->vm_idx[i] = i;
>  		} else {
>  			for (i = 0; i < vm_num; i++)
>  				if (pvt->vm_idx[i] >= vm_num ||
> -				    pvt->vm_idx[i] == 0xff) {
> -					num = i;
> +				    pvt->vm_idx[i] == 0xff)
>  					break;
> -				}
> -		}
>  
> -		/*
> -		 * Incase intel,vm-map property is not defined, we assume
> -		 * incremental channel numbers.
> -		 */
> -		for (i = num; i < vm_num; i++)
> -			pvt->vm_idx[i] = i;
> +			vm_num = i;
> +		}
>  
> -		in_config = devm_kcalloc(dev, num + 1,
> +		in_config = devm_kcalloc(dev, vm_num + 1,
>  					 sizeof(*in_config), GFP_KERNEL);
>  		if (!in_config)
>  			return -ENOMEM;
>  
> -		memset32(in_config, HWMON_I_INPUT, num);
> -		in_config[num] = 0;
> +		memset32(in_config, HWMON_I_INPUT, vm_num);
> +		in_config[vm_num] = 0;
>  		pvt_in.config = in_config;
>  
>  		pvt_info[index++] = &pvt_in;