pci/dmar: correct off-by-one error in dmar_fault()
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>
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@ -1226,7 +1226,7 @@ irqreturn_t dmar_fault(int irq, void *dev_id)
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source_id, guest_addr);
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fault_index++;
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if (fault_index > cap_num_fault_regs(iommu->cap))
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if (fault_index >= cap_num_fault_regs(iommu->cap))
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fault_index = 0;
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spin_lock_irqsave(&iommu->register_lock, flag);
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}
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