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@xxxxxx>
---
drivers/pci/dmar.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 7b287cb..c0c776f 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -1212,7 +1212,7 @@ 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);
}
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