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Date:	Sat, 21 Apr 2012 16:23:56 +0800
From:	Huajun Li <>
To:	Ming Lei <>
Cc:	Oliver Neukum <>,
	Alan Stern <>,
	Dave Jones <>,,,
	Fedora Kernel Team <>
Subject: Re: use-after-free in usbnet

On Sat, Apr 21, 2012 at 3:56 PM, Ming Lei <> wrote:
> Hi Huajun,
> On Sat, Apr 21, 2012 at 3:50 PM, Huajun Li <> wrote:
>> Did we on the same page, could you please review my patch again?
>> My draft patch was based on current mainline( 3.4.0-rc3)  which had
>> already integrated your previous patch. And in my patch, it replaced
>> skb_queue_walk_safe() with skb_queue_walk(), so you will not see  'tmp
>> = skb->next'  any more.
> Replace skb_queue_walk_safe with skb_queue_walk doesn't improve
> the problem, since 'skb = skb->next' in skb_queue_walk still may trigger
> the oops, does it?

In each loop, my patch traverse the queue from its head, and it always
holds  q->lock when it need refer "skb->next", this can make sure the
right skb is not moved out of rxq/txq.

Can this fix what you concern? If so, IMO, there is no need to revert
your previous patch.
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