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intel-iommu: Fix intel_iommu_unmap_range() with size 0

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After some API change, intel_iommu_unmap_range() introduced a assumption that
parameter size != 0, otherwise the dma_pte_clean_range() would have a
overflowed argument. But the user like KVM don't have this assumption before,
then some BUG() triggered.

Fix it by ignoring size = 0.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sheng Yang 2009-07-08 11:52:52 +01:00 committed by Linus Torvalds
parent 0f2f2221b4
commit 4b99d35270
1 changed files with 3 additions and 0 deletions
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3
drivers/pci/intel-iommu.c
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@ -3600,6 +3600,9 @@ static void intel_iommu_unmap_range(struct iommu_domain *domain,
{
struct dmar_domain *dmar_domain = domain->priv;
if (!size)
return;
dma_pte_clear_range(dmar_domain, iova >> VTD_PAGE_SHIFT,
(iova + size - 1) >> VTD_PAGE_SHIFT);