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iommu/amd: Handle large pages correctly in free_pagetable

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Make sure that we are skipping over large PTEs while walking
the page-table tree.

Cc: stable@kernel.org
Fixes: 5c34c403b7 ("iommu/amd: Fix memory leak in free_pagetable")
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-06-18 10:48:34 +02:00
parent e6aabee05f
commit 0b3fff54bc
1 changed files with 6 additions and 0 deletions
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6
drivers/iommu/amd_iommu.c
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@ -1866,9 +1866,15 @@ 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); \
} \