linux-kernel - Re: [PATCH 1/3] ipack: avoid double free on device->id

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Date:	Fri, 8 Mar 2013 09:47:01 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Samuel Iglesias Gonsalvez <siglesias@...lia.com>
Cc:	industrypack-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Jens Taprogge <jens.taprogge@...rogge.org>
Subject: Re: [PATCH 1/3] ipack: avoid double free on device->id

On Fri, Mar 08, 2013 at 09:21:45AM +0100, Samuel Iglesias Gonsalvez wrote:
> Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@...lia.com>
> ---
>  drivers/ipack/ipack.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/ipack/ipack.c b/drivers/ipack/ipack.c
> index 7ec6b20..599d4ff 100644
> --- a/drivers/ipack/ipack.c
> +++ b/drivers/ipack/ipack.c
> @@ -24,6 +24,7 @@ static void ipack_device_release(struct device *dev)
>  {
>  	struct ipack_device *device = to_ipack_dev(dev);
>  	kfree(device->id);
> +	device->id = NULL;

How does that keep anything from being freed twice?

>  	device->release(device);

device should now be gone after this call, right?  What am I missing?

thanks,

greg k-h
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