Gitweb: http://git.kernel.org/linus/4b99d3527041bec1abe9903263a3a1b7d2ba0c4a
Commit: 4b99d3527041bec1abe9903263a3a1b7d2ba0c4a
Parent: 0f2f2221b4ad816567394a52643963428fd353cd
Author: Sheng Yang <sheng@linux.intel.com>
AuthorDate: Wed Jul 8 11:52:52 2009 +0100
Committer: Linus Torvalds <torvalds@linux-foundation.org>
CommitDate: Wed Jul 8 09:35:10 2009 -0700
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>
---
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 360fb67..ebc9b8d 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);
--
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