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

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Date:	Fri, 08 Mar 2013 19:11:02 +0100
From:	Samuel Iglesias Gonsálvez <siglesias@...lia.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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

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On 03/08/2013 06:47 PM, Greg Kroah-Hartman wrote:
> 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?
> 

Yes, you are right. It's not possible to have it freed twice once it's
in ipack_device_release().

You can skip this patch. If you want, I can resend the others accordingly.

Sam

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