netdev - Re: [PATCH 1/2] usbnet: increase URB reference count before usb_unlink

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Message-Id: <20120322.193336.57225513335096988.davem@davemloft.net>
Date:	Thu, 22 Mar 2012 19:33:36 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	gregkh@...uxfoundation.org
Cc:	tom.leiming@...il.com, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org, stable@...nel.org,
	bigeasy@...utronix.de, stern@...land.harvard.edu, oliver@...kum.org
Subject: Re: [PATCH 1/2] usbnet: increase URB reference count before
 usb_unlink_urb

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Date: Thu, 22 Mar 2012 07:35:53 -0700

> On Thu, Mar 22, 2012 at 09:22:18PM +0800, Ming Lei wrote:
>> Commit 4231d47e6fe69f061f96c98c30eaf9fb4c14b96d(net/usbnet: avoid
>> recursive locking in usbnet_stop()) fixes the recursive locking
>> problem by releasing the skb queue lock, but it makes usb_unlink_urb
>> racing with defer_bh, and the URB to being unlinked may be freed before
>> or during calling usb_unlink_urb, so use-after-free problem may be
>> triggerd inside usb_unlink_urb.
>> 
>> The patch fixes the use-after-free problem by increasing URB
>> reference count with skb queue lock held before calling
>> usb_unlink_urb, so the URB won't be freed until return from
>> usb_unlink_urb.
>> 
>> Cc: stable@...nel.org
>> Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
>> Cc: Alan Stern <stern@...land.harvard.edu>
>> Cc: Oliver Neukum <oliver@...kum.org>
>> Reported-by: Dave Jones <davej@...hat.com>
>> Signed-off-by: Ming Lei <tom.leiming@...il.com>
> 
> Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Applied.
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