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| author | Sheng Yang <sheng@linux.intel.com> | 2009-07-08 14:52:52 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-07-08 20:35:10 +0400 |
| commit | 4b99d3527041bec1abe9903263a3a1b7d2ba0c4a (patch) | |
| tree | c28eb8558d7cdc56607f9eff4c8073928b32d202 | |
| parent | 0f2f2221b4ad816567394a52643963428fd353cd (diff) | |
| download | linux-4b99d3527041bec1abe9903263a3a1b7d2ba0c4a.tar.xz | |
intel-iommu: Fix intel_iommu_unmap_range() with size 0
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>
| -rw-r--r-- | drivers/pci/intel-iommu.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index 360fb67a30d7..ebc9b8dca881 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -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); |