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Commit 0b3fff54 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu/amd: Handle large pages correctly in free_pagetable 



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

Cc: stable@kernel.org
Fixes: 5c34c403 ("iommu/amd: Fix memory leak in free_pagetable")
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent e6aabee0

drivers/iommu/amd_iommu.c

+6 −0
Original line number Original line Diff line number Diff line
@@ -1866,9 +1866,15 @@ static void free_pt_##LVL (unsigned long __pt) \ 
	pt = (u64 *)__pt;					\

	pt = (u64 *)__pt;					\

								\

								\

	for (i = 0; i < 512; ++i) {				\

	for (i = 0; i < 512; ++i) {				\

		/* PTE present? */				\

		if (!IOMMU_PTE_PRESENT(pt[i]))			\

		if (!IOMMU_PTE_PRESENT(pt[i]))			\

			continue;				\

			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]);	\

		p = (unsigned long)IOMMU_PTE_PAGE(pt[i]);	\

		FN(p);						\

		FN(p);						\

	}							\

	}							\