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authorTroy Heber <troy.heber@hp.com>2009-08-19 21:26:11 (GMT)
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-08-30 18:05:04 (GMT)
commit8211a7b5857914058c52ae977c96463e419b37ab (patch)
tree3a3d61d43dd08892d0d1bb1ffa8dc635f634b31e /drivers/pci/dmar.c
parent2ff729f5445cc47d1910386c36e53fc6b1c5e47a (diff)
downloadlinux-8211a7b5857914058c52ae977c96463e419b37ab.tar.xz
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>
Diffstat (limited to 'drivers/pci/dmar.c')
-rw-r--r--drivers/pci/dmar.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 380b60e..3264b62 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);
}