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pci/dmar: correct off-by-one error in dmar_fault()

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DMAR faults are recorded into a ring of "fault recording registers".
fault_index is a 0-based index into the ring. The code allows the
0-based fault_index to be equal to the total number of fault registers
available from the cap_num_fault_regs() macro, which causes access
beyond the last available register.

Signed-off-by Troy Heber <troy.heber@hp.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Troy Heber 2009-08-19 15:26:11 -06:00 committed by David Woodhouse
parent 2ff729f544
commit 8211a7b585
1 changed files with 1 additions and 1 deletions
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2
drivers/pci/dmar.c
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@ -1226,7 +1226,7 @@ irqreturn_t dmar_fault(int irq, void *dev_id)
source_id, guest_addr);
fault_index++;
if (fault_index > cap_num_fault_regs(iommu->cap))
if (fault_index >= cap_num_fault_regs(iommu->cap))
fault_index = 0;
spin_lock_irqsave(&iommu->register_lock, flag);
}