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Message-Id: <20150708073239.477457249@linuxfoundation.org>
Date: Wed, 8 Jul 2015 00:35:19 -0700
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 4.1 30/56] iommu/amd: Handle large pages correctly in free_pagetable
4.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Joerg Roedel <jroedel@...e.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@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/iommu/amd_iommu.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1869,9 +1869,15 @@ static void free_pt_##LVL (unsigned long
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); \
} \
--
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