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intel-iommu: Fix use after release during device attach 

Obtain the new pgd pointer before releasing the page containing this
value.

Cc: stable@kernel.org
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Jan Kiszka 2010-11-02 08:05:51 +01:00 committed by David Woodhouse
parent e78bf5e6cb
commit 7a6610139a
1 changed files with 1 additions and 1 deletions
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2
drivers/pci/intel-iommu.c
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@ -3627,9 +3627,9 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
pte = dmar_domain->pgd; pte = dmar_domain->pgd;
if (dma_pte_present(pte)) { if (dma_pte_present(pte)) {
free_pgtable_page(dmar_domain->pgd);
dmar_domain->pgd = (struct dma_pte *) dmar_domain->pgd = (struct dma_pte *)
phys_to_virt(dma_pte_addr(pte)); phys_to_virt(dma_pte_addr(pte));
free_pgtable_page(pte);
} }
dmar_domain->agaw--; dmar_domain->agaw--;
} }