linux-kernel - Re: [PATCH v1] platform/x86/dell/dell-rbtn: Fix resources leaking on error path

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Message-ID: <27dfd35-1d9d-b52f-ee7-1a5b9b25794@linux.intel.com>
Date:   Tue, 13 Jun 2023 12:28:01 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Michal Wilczynski <michal.wilczynski@...el.com>
cc:     linux-acpi@...r.kernel.org, rafael@...nel.org,
        andriy.shevchenko@...el.com, pali@...nel.org, hdegoede@...hat.com,
        markgross@...nel.org, fengguang.wu@...el.com,
        dvhart@...ux.intel.com, platform-driver-x86@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] platform/x86/dell/dell-rbtn: Fix resources leaking
 on error path

On Mon, 12 Jun 2023, Michal Wilczynski wrote:

> Currently rbtn_add() in case of failure is leaking resources. Fix this
> by adding a proper rollback. While at it, remove unnecessary assignment
> of NULL to device->driver_data and unnecessary whitespace, plus add a
> break for the default case in a switch.
> 
> Suggested-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> Fixes: 817a5cdb40c8 ("dell-rbtn: Dell Airplane Mode Switch driver")
> Signed-off-by: Michal Wilczynski <michal.wilczynski@...el.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/platform/x86/dell/dell-rbtn.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/x86/dell/dell-rbtn.c b/drivers/platform/x86/dell/dell-rbtn.c
> index aa0e6c907494..e9b3f9c3ab7d 100644
> --- a/drivers/platform/x86/dell/dell-rbtn.c
> +++ b/drivers/platform/x86/dell/dell-rbtn.c
> @@ -420,10 +420,12 @@ static int rbtn_add(struct acpi_device *device)
>  		break;
>  	default:
>  		ret = -EINVAL;
> +		break;
>  	}
> +	if (ret)
> +		rbtn_acquire(device, false);
>  
>  	return ret;
> -
>  }
>  
>  static void rbtn_remove(struct acpi_device *device)
> @@ -442,7 +444,6 @@ static void rbtn_remove(struct acpi_device *device)
>  	}
>  
>  	rbtn_acquire(device, false);
> -	device->driver_data = NULL;
>  }
>  
>  static void rbtn_notify(struct acpi_device *device, u32 event)

I'm a bit worried the stable people might not like "these while at it 
parts". Those changes too are all good but unrelated to the actual fix so 
they should appear in their own patches.

-- 
 i.