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Commit 00edefae authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
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[PATCH] x86-64: Fix off by one error in IOMMU boundary checking 



Should be harmless because there is normally no memory there, but
technically it was incorrect.

Pointed out by Leo Duran

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent ffb60175

arch/x86_64/kernel/pci-gart.c

+2 −2
Original line number Diff line number Diff line
@@ -185,7 +185,7 @@ static void iommu_full(struct device *dev, size_t size, int dir) 
static inline int need_iommu(struct device *dev, unsigned long addr, size_t size)

{ 

	u64 mask = *dev->dma_mask;

	int high = addr + size >= mask;

	int high = addr + size > mask;

	int mmu = high;

	if (force_iommu) 

		mmu = 1;
@@ -195,7 +195,7 @@ static inline int need_iommu(struct device *dev, unsigned long addr, size_t size 
static inline int nonforced_iommu(struct device *dev, unsigned long addr, size_t size)

{ 

	u64 mask = *dev->dma_mask;

	int high = addr + size >= mask;

	int high = addr + size > mask;

	int mmu = high;

	return mmu; 

}