| From | Kamal Mostafa <> | Subject | [PATCH 3.13.y-ckt 078/132] iommu/amd: Handle large pages correctly in free_pagetable | Date | Wed, 22 Jul 2015 18:59:56 -0700 |
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3.13.11-ckt24 -stable review patch. If anyone has any objections, please let me know.
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From: Joerg Roedel <jroedel@suse.de>
commit 0b3fff54bc01e8e6064d222a33e6fa7adabd94cd upstream.
Make sure that we are skipping over large PTEs while walking the page-table tree.
Fixes: 5c34c403b723 ("iommu/amd: Fix memory leak in free_pagetable") Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/iommu/amd_iommu.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 1d3e371..1d7745c6 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -1922,9 +1922,15 @@ static void free_pt_##LVL (unsigned long __pt) \ pt = (u64 *)__pt; \ \ for (i = 0; i < 512; ++i) { \ + /* PTE present? */ \ if (!IOMMU_PTE_PRESENT(pt[i])) \ continue; \ \ + /* Large PTE? */ \ + if (PM_PTE_LEVEL(pt[i]) == 0 || \ + PM_PTE_LEVEL(pt[i]) == 7) \ + continue; \ + \ p = (unsigned long)IOMMU_PTE_PAGE(pt[i]); \ FN(p); \ } \ -- 1.9.1
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