Commit 57886518 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu: Check for valid pgsize_bitmap in iommu_map/unmap 



In case the page-size bitmap is zero the code path in
iommu_map and iommu_unmap is undefined. Make it defined and
return -ENODEV in this case.

Signed-off-by: default avatarJoerg Roedel <joro@8bytes.org>
parent a8b8a88a

drivers/iommu/iommu.c

+4 −2
Original line number Diff line number Diff line
@@ -734,7 +734,8 @@ int iommu_map(struct iommu_domain *domain, unsigned long iova, 
	size_t orig_size = size;

	int ret = 0;



	if (unlikely(domain->ops->map == NULL))

	if (unlikely(domain->ops->unmap == NULL ||

		     domain->ops->pgsize_bitmap == 0UL))

		return -ENODEV;



	/* find out the minimum page size supported */
@@ -808,7 +809,8 @@ size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size) 
	size_t unmapped_page, unmapped = 0;

	unsigned int min_pagesz;



	if (unlikely(domain->ops->unmap == NULL))

	if (unlikely(domain->ops->unmap == NULL ||

		     domain->ops->pgsize_bitmap == 0UL))

		return -ENODEV;



	/* find out the minimum page size supported */

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