netdev - Re: [PATCH] cdc-phonet: Don't leak in usbpn

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Date:	Wed, 08 Aug 2012 16:05:04 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	remi@...lab.net
Cc:	jj@...osbits.net, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	gregkh@...uxfoundation.org
Subject: Re: [PATCH] cdc-phonet: Don't leak in usbpn_open

From: "Rémi Denis-Courmont" <remi@...lab.net>
Date: Wed, 8 Aug 2012 10:12:06 +0300

> Le mercredi 8 août 2012 00:56:26 Jesper Juhl, vous avez écrit :
>> We allocate memory for 'req' with usb_alloc_urb() and then test
>> 'if (!req || rx_submit(pnd, req, GFP_KERNEL | __GFP_COLD))'.
>> If we enter that branch due to '!req' then there is no problem. But if
>> we enter the branch due to 'req' being != 0 and the 'rx_submit()' call
>> being false, then we'll leak the memory we allocated.
>> Deal with the leak by always calling 'usb_free_urb(req)' when entering
>> the branch. If 'req' happens to be 0 then the call is harmless, if it
>> is not 0 then we free the memory we allocated but don't need.
>>
>> Signed-off-by: Jesper Juhl <jj@...osbits.net>
> 
> Acked-by: Rémi Denis-Courmont <remi@...lab.net>

Applied.
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