linux-kernel - Re: [PATCH] kvm: fix irqfd assign/deassign race

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Message-ID: <20100920183547.GC27404@amt.cnet>
Date:	Mon, 20 Sep 2010 15:35:47 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Avi Kivity <avi@...hat.com>, Tejun Heo <tj@...nel.org>,
	Gregory Haskins <ghaskins@...ell.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kvm: fix irqfd assign/deassign race

On Sun, Sep 19, 2010 at 07:02:31PM +0200, Michael S. Tsirkin wrote:
> I think I see the following (theoretical) race:
> 
> During irqfd assign, we drop irqfds lock before we
> schedule inject work. Therefore, deassign running
> on another CPU could cause shutdown and flush to run
> before inject, causing user after free in inject.
> 
> A simple fix it to schedule inject under the lock.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---

Applied, thanks.

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