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| author | Robin Murphy <robin.murphy@arm.com> | 2019-10-25 19:08:31 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2019-11-04 19:34:31 +0000 |
| commit | f7b90d2c7422a815c094961751582347935045cd (patch) | |
| tree | 7cdd6c7645b516a841b276fe6ea12cd581ba8f68 /drivers/iommu/io-pgtable-arm.c | |
| parent | b5813c164ec82790be892b0f8e79cf080a503706 (diff) | |
| download | linux-stable-f7b90d2c7422a815c094961751582347935045cd.tar.gz linux-stable-f7b90d2c7422a815c094961751582347935045cd.tar.bz2 linux-stable-f7b90d2c7422a815c094961751582347935045cd.zip | |
iommu/io-pgtable-arm: Rationalise size check
It makes little sense to only validate the requested size after we think
we've found a matching block size - making the check up-front is simple,
and far more logical than waiting to walk off the bottom of the table to
infer that we must have been passed a bogus size to start with.
We're missing an equivalent check on the unmap path, so add that as well
for consistency.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/iommu/io-pgtable-arm.c')
| -rw-r--r-- | drivers/iommu/io-pgtable-arm.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index c5c4f247acb4..abe794576e8f 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -392,7 +392,7 @@ static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova, ptep += ARM_LPAE_LVL_IDX(iova, lvl, data); /* If we can install a leaf entry at this level, then do so */ - if (size == block_size && (size & cfg->pgsize_bitmap)) + if (size == block_size) return arm_lpae_init_pte(data, iova, paddr, prot, lvl, ptep); /* We can't allocate tables at the final level */ @@ -479,6 +479,7 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova, phys_addr_t paddr, size_t size, int iommu_prot) { struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); + struct io_pgtable_cfg *cfg = &data->iop.cfg; arm_lpae_iopte *ptep = data->pgd; int ret, lvl = ARM_LPAE_START_LVL(data); arm_lpae_iopte prot; @@ -487,6 +488,9 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova, if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE))) return 0; + if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size)) + return -EINVAL; + if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias) || paddr >= (1ULL << data->iop.cfg.oas))) return -ERANGE; @@ -652,9 +656,13 @@ static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova, size_t size, struct iommu_iotlb_gather *gather) { struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); + struct io_pgtable_cfg *cfg = &data->iop.cfg; arm_lpae_iopte *ptep = data->pgd; int lvl = ARM_LPAE_START_LVL(data); + if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size)) + return 0; + if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias))) return 0; |