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x86, pci: iommu fix potential overflow in alloc_iommu() 

It is possible that alloc_iommu()'s boundary_size overflows as
dma_get_seg_boundary can return 0xffffffff.  In that case, further usage of
boundary_size triggers a BUG_ON() in the iommu code.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Prarit Bhargava 2008-07-21 10:15:22 -04:00 committed by Ingo Molnar
parent c010b2f76c
commit 05d3ed0a1f
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/pci-gart_64.c
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@ -93,7 +93,7 @@ static unsigned long alloc_iommu(struct device *dev, int size)
base_index = ALIGN(iommu_bus_base & dma_get_seg_boundary(dev),
PAGE_SIZE) >> PAGE_SHIFT;
boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
boundary_size = ALIGN((unsigned long long)dma_get_seg_boundary(dev) + 1,
PAGE_SIZE) >> PAGE_SHIFT;
spin_lock_irqsave(&iommu_bitmap_lock, flags);