tree a0307607cdfb450cabc1494fd2bc9945d967bdb3
parent c1ae3cfa0e89fa1a7ecc4c99031f5e9ae99d9201
author Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> 1488198625 +0200
committer Will Deacon <will.deacon@arm.com> 1489170214 +0000

iommu/io-pgtable-arm: 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>