linux-kernel - Crash in intel_iommu_assign

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Date:	Mon, 01 Nov 2010 12:41:21 +0100
From:	Jan Kiszka <jan.kiszka@....de>
To:	Sheng Yang <sheng@...ux.intel.com>
CC:	kvm <kvm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Crash in intel_iommu_assign_device

Hi Sheng,

I'm not claiming to understand the details, but this looks like use
(dereference of pte via dma_pte_addr) after release (free_pgtable_page
of dmar_domain->pgd aka pte) to me:

static int intel_iommu_attach_device(struct iommu_domain *domain,
				     struct device *dev)
{
	[...]
		pte = dmar_domain->pgd;
		if (dma_pte_present(pte)) {
			free_pgtable_page(dmar_domain->pgd);
			dmar_domain->pgd = (struct dma_pte *)
				phys_to_virt(dma_pte_addr(pte));
		}

At least it crashes here right on pte->val access. Swap both lines?

Jan


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