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    Subject[PATCH] [102/106] From: intel-iommu: Fix use after release during device attach
    Date
    2.6.35-longterm review patch.  If anyone has any objections, please let me know.

    ------------------
    Date: Tue, 2 Nov 2010 08:05:51 +0100
    Subject: [PATCH] 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>
    Signed-off-by: Andi Kleen <ak@linux.intel.com>
    Reviewed-by: Sheng Yang <sheng@linux.intel.com>
    Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
    ---
    drivers/pci/intel-iommu.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    Index: linux-2.6.35.y/drivers/pci/intel-iommu.c
    ===================================================================
    --- linux-2.6.35.y.orig/drivers/pci/intel-iommu.c
    +++ linux-2.6.35.y/drivers/pci/intel-iommu.c
    @@ -3638,9 +3638,9 @@ static int intel_iommu_attach_device(str

    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));
    + free_pgtable_page(pte);
    }
    dmar_domain->agaw--;
    }

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