linux-kernel - Re: [PATCH] platform/x86: hp-bioscfg: Fix error handling in hp_add_other

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: <b821c9e6-ecac-4682-a624-1b930a671bca@redhat.com>
Date:   Fri, 10 Nov 2023 12:20:10 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>,
        Jorge Lopez <jorge.lopez2@...com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Mark Gross <markgross@...nel.org>,
        Thomas Weißschuh <linux@...ssschuh.net>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     dan.carpenter@...aro.org, kernel-janitors@...r.kernel.org,
        error27@...il.com, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] platform/x86: hp-bioscfg: Fix error handling in
 hp_add_other_attributes()

Hi Harshit,

On 11/10/23 10:04, Harshit Mogalapalli wrote:
> 1. acpi_object *obj is unused in this function, so delete it, also
>    delete a unnecessary kfree(obj);
> 2. Fix a memory leak of 'attr_name_kobj' in the error handling path.
> 3. When kobject_init_and_add() fails on every subsequent error path call
>    kobject_put() to cleanup.

If you are fixing 3 different things, please do so in a series
of 3 patches each addressing 1 of the 3 things.

Regards,

Hans



> 
> Fixes: a34fc329b189 ("platform/x86: hp-bioscfg: bioscfg")
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <error27@...il.com>
> Closes: https://lore.kernel.org/r/202309201412.on0VXJGo-lkp@intel.com/
> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
> ---
> This is only compile tested, based on static analysis.
> ---
>  drivers/platform/x86/hp/hp-bioscfg/bioscfg.c | 14 ++++++--------
>  1 file changed, 6 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c b/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c
> index 5798b49ddaba..b28e52b64690 100644
> --- a/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c
> +++ b/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c
> @@ -588,7 +588,6 @@ static void release_attributes_data(void)
>  static int hp_add_other_attributes(int attr_type)
>  {
>  	struct kobject *attr_name_kobj;
> -	union acpi_object *obj = NULL;
>  	int ret;
>  	char *attr_name;
>  
> @@ -596,8 +595,8 @@ static int hp_add_other_attributes(int attr_type)
>  
>  	attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL);
>  	if (!attr_name_kobj) {
> -		ret = -ENOMEM;
> -		goto err_other_attr_init;
> +		mutex_unlock(&bioscfg_drv.mutex);
> +		return -ENOMEM;
>  	}
>  
>  	/* Check if attribute type is supported */
> @@ -614,15 +613,15 @@ static int hp_add_other_attributes(int attr_type)
>  
>  	default:
>  		pr_err("Error: Unknown attr_type: %d\n", attr_type);
> -		ret = -EINVAL;
> -		goto err_other_attr_init;
> +		kfree(attr_name_kobj);
> +		mutex_unlock(&bioscfg_drv.mutex);
> +		return -EINVAL;
>  	}
>  
>  	ret = kobject_init_and_add(attr_name_kobj, &attr_name_ktype,
>  				   NULL, "%s", attr_name);
>  	if (ret) {
>  		pr_err("Error encountered [%d]\n", ret);
> -		kobject_put(attr_name_kobj);
>  		goto err_other_attr_init;
>  	}
>  
> @@ -647,10 +646,9 @@ static int hp_add_other_attributes(int attr_type)
>  
>  	mutex_unlock(&bioscfg_drv.mutex);
>  	return 0;
> -
>  err_other_attr_init:
> +	kobject_put(attr_name_kobj);
>  	mutex_unlock(&bioscfg_drv.mutex);
> -	kfree(obj);
>  	return ret;
>  }
>