linux-kernel - Re: [PATCH v2 1/1] platform/x86: surface3-wmi: Balance locking on error path

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Date:   Thu, 15 Dec 2016 12:30:36 -0800
From:   Darren Hart <dvhart@...radead.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v2 1/1] platform/x86: surface3-wmi: Balance locking on
 error path

On Thu, Dec 15, 2016 at 07:41:06PM +0200, Andy Shevchenko wrote:
> There is a possibility that lock will be left acquired.
> Consolidate error path under out_free_unlock label.
> 
> Reported-by: kbuild test robot <fengguang.wu@...el.com>
> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> In v2:
> - address Darren's comments
> - update tags (in particular put proper email of reporter)
> 
> I dare to push this to testing ahead. If anyone has objections, tell me asap.

Looks good, thanks.

Reviewed-by: Darren Hart <dvhart@...ux.intel.com>

> 
>  drivers/platform/x86/surface3-wmi.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/platform/x86/surface3-wmi.c b/drivers/platform/x86/surface3-wmi.c
> index 5553b2b85e0a..cbf4d83a7271 100644
> --- a/drivers/platform/x86/surface3-wmi.c
> +++ b/drivers/platform/x86/surface3-wmi.c
> @@ -60,10 +60,10 @@ static DEFINE_MUTEX(s3_wmi_lock);
>  
>  static int s3_wmi_query_block(const char *guid, int instance, int *ret)
>  {
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
>  	acpi_status status;
>  	union acpi_object *obj;
> -
> -	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> +	int error = 0;
>  
>  	mutex_lock(&s3_wmi_lock);
>  	status = wmi_query_block(guid, instance, &output);
> @@ -77,13 +77,14 @@ static int s3_wmi_query_block(const char *guid, int instance, int *ret)
>  			       obj->type == ACPI_TYPE_BUFFER ?
>  						obj->buffer.length : 0);
>  		}
> -		kfree(obj);
> -		return -EINVAL;
> +		error = -EINVAL;
> +		goto out_free_unlock;
>  	}
>  	*ret = obj->integer.value;
> + out_free_unlock:
>  	kfree(obj);
>  	mutex_unlock(&s3_wmi_lock);
> -	return 0;
> +	return error;
>  }
>  
>  static inline int s3_wmi_query_lid(int *ret)
> -- 
> 2.11.0
> 
> --
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> 

-- 
Darren Hart
Intel Open Source Technology Center