linux-kernel - Re: [PATCH] iommu/iova: validate iova_domain input to put_iova

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Date:	Thu, 14 Jul 2016 10:34:20 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Nate Watterson <nwatters@...eaurora.org>
Cc:	robin.murphy@....com, iommu@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/iova: validate iova_domain input to put_iova_domain

On Wed, Jul 13, 2016 at 02:49:32PM -0400, Nate Watterson wrote:
> Passing a NULL or uninitialized iova_domain into put_iova_domain
> will currently crash the kernel when the unconfigured iova_domain
> data members are accessed. To prevent this from occurring, this patch
> adds a check to make sure that the domain is non-NULL and that the
> domain granule is non-zero. The granule can be used to check if the
> domain was properly initialized because calling init_iova_domain
> with a granule of zero would have already triggered a BUG statement
> crashing the kernel.

Have you seen real crashes happening because of this?


	Joerg