linux-kernel - Re: [PATCH] usbnet: fix race condition caused spinlock bad magic issue

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Date:	Mon, 11 Nov 2013 08:44:23 +0100
From:	Oliver Neukum <oneukum@...e.de>
To:	wangbiao <biao.wang@...el.com>
Cc:	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mingo@...e.hu, a.p.zijlstra@...llo.nl, rusty@...tcorp.com.au,
	william.douglas@...el.com
Subject: Re: [PATCH] usbnet: fix race condition caused spinlock bad magic
 issue

On Mon, 2013-11-11 at 11:08 +0800, wangbiao wrote:
> From: wang, biao <biao.wang@...el.com>
> Date: Mon, 11 Nov 2013 10:23:40 +0800
> Subject: [PATCH] usbnet: fix race condition caused spinlock bad magic issue
> 
> there is race between usbnet_terminate_urbs and usbnet_bh, when
> unlink_wakeup used in usbnet_bh, it may be already freed and used by
> other function as unlink_wakeup was a local var on stack.

Hi,

the debugging is good, but the fix is not good.

If you use a global variable, you can init the head
only once, that is on module load, not during probe()
Doing so can mess up operations with multiple modules
as a hotplug happens.

	Regards
		Oliver

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