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iommu/io-pgtable-arm-v7s: Check for leaf entry before dereferencing it
authorOleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Mon, 27 Feb 2017 12:30:26 +0000 (14:30 +0200)
committerWill Deacon <will.deacon@arm.com>
Fri, 10 Mar 2017 18:23:34 +0000 (18:23 +0000)
commita03849e7210277fa212779b7cd9c30e1ab6194b2
treec4cbc53783a84410cd143a758202240bebed845ctree | snapshot (tar.gz zip)
parented46e66cc1b3d684042f92dfa2ab15ee917b4caccommit | diff
iommu/io-pgtable-arm-v7s: Check for leaf entry before dereferencing it

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>
drivers/iommu/io-pgtable-arm-v7s.c diff | blob | blame | history