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Patch in this message | | | From | "Levin, Alexander (Sasha Levin)" <> | Subject | [PATCH review for 4.4 42/47] iommu/io-pgtable-arm: Check for leaf entry before dereferencing it | Date | Wed, 20 Sep 2017 04:45:10 +0000 |
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From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
[ Upstream commit ed46e66cc1b3d684042f92dfa2ab15ee917b4cac ]
Do a check for already installed leaf entry at the current level before dereferencing it in order to avoid walking the page table down with wrong pointer to the next level.
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> CC: Will Deacon <will.deacon@arm.com> CC: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> --- drivers/iommu/io-pgtable-arm.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index dad768caa9c5..18751b1dfd3d 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -335,8 +335,12 @@ static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova, if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS) pte |= ARM_LPAE_PTE_NSTABLE; __arm_lpae_set_pte(ptep, pte, cfg); - } else { + } else if (!iopte_leaf(pte, lvl)) { cptep = iopte_deref(pte, data); + } else { + /* We require an unmap first */ + WARN_ON(!selftest_running); + return -EEXIST; } /* Rinse, repeat */ -- 2.11.0
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