linux-kernel - Re: irq_desc use-after-free in smp_irq_move_cleanup

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Message-ID: <56562FF7.60107@stratus.com>
Date:	Wed, 25 Nov 2015 17:02:31 -0500
From:	Joe Lawrence <joe.lawrence@...atus.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>, <x86@...nel.org>
Subject: Re: irq_desc use-after-free in smp_irq_move_cleanup_interrupt

On 11/25/2015 04:12 PM, Thomas Gleixner wrote:
> On Wed, 25 Nov 2015, Thomas Gleixner wrote:
>> So if CPU1 gets the IPI _BEFORE_ move_in_progress is set to 0, and
>> does not get another IPI before the next move ..... That has been that
>> way forever.
>>
>> Duh. Working on a real fix this time.
>
> Here you go. Completely untested of course.
>

Hi Thomas -- thanks for taking a look!  (Well, the analysis looks like 
more than *just* a look :)

I'll give the patch a go when I get back in the office next week.

-- Joe
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