linux-kernel - Re: [PATCH] iommu/vt-d: fix race between free_irte() and get

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Message-ID: <20140723144024.GA14017@8bytes.org>
Date:	Wed, 23 Jul 2014 16:40:24 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Greg Edwards <gedwards@....com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/vt-d: fix race between free_irte() and get_irte()

On Tue, Jul 22, 2014 at 08:27:19AM -0600, Greg Edwards wrote:
> get_irte() can race with free_irte() and dereference a NULL iommu
> pointer.

Have you seen any real occurance of this race? Get_irte is called in the
set_affinity path, how can that race with the irq being freed?


	Joerg

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