Commit f4edd6d5 authored Jun 18, 2015 by Joerg Roedel Committed by Sasha Levin Jul 13, 2015

iommu/amd: Handle large pages correctly in free_pagetable



[ Upstream commit 0b3fff54bc01e8e6064d222a33e6fa7adabd94cd ]

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: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

parent 87293694

drivers/iommu/amd_iommu.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -1870,9 +1870,15 @@ 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); \
		} \