linux-kernel - Re: perf: use after free in perf_remove_from

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Message-ID: <20140529150705.GJ19143@laptop.programming.kicks-ass.net>
Date:	Thu, 29 May 2014 17:07:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Ingo Molnar <mingo@...nel.org>, acme@...stprotocols.net,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dave Jones <davej@...hat.com>
Subject: Re: perf: use after free in perf_remove_from_context

On Thu, May 29, 2014 at 10:47:09AM -0400, Sasha Levin wrote:
> It doesn't work out well because we later lock a mutex in sync_child_event().
> 

Urgh, right you are. I'll go stare at it more. It shouldn't have
mattered, because the mutex we take just before should ensure existence,
but.. you know.. :-)
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