diff options
| author | Troy Heber <troy.heber@hp.com> | 2009-08-19 15:26:11 -0600 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-08-30 19:05:04 +0100 |
| commit | 8211a7b5857914058c52ae977c96463e419b37ab (patch) | |
| tree | 3a3d61d43dd08892d0d1bb1ffa8dc635f634b31e | |
| parent | 2ff729f5445cc47d1910386c36e53fc6b1c5e47a (diff) | |
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>
| -rw-r--r-- | 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 380b60e677e..3264b626725 100644 --- a/drivers/pci/dmar.c +++ b/drivers/pci/dmar.c @@ -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); } |