intel-iommu: Fix array overflow

Fix possible array overflow:

drivers/pci/intel-iommu.c: In function ¡dmar_get_fault_reason¢:
drivers/pci/intel-iommu.c:753: warning: array subscript is above array bounds
drivers/pci/intel-iommu.c: In function ¡iommu_page_fault¢:
drivers/pci/intel-iommu.c:753: warning: array subscript is above array bounds

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Cc: Mark Gross <mgross@linux.intel.com>
Acked-by: "Keshavamurthy, Anil S" <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 8af1d9a261e5..e079a5237c94 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -749,8 +749,8 @@ static char *fault_reason_strings[] =
 
 char *dmar_get_fault_reason(u8 fault_reason)
 {
-        if (fault_reason > MAX_FAULT_REASON_IDX)
-                return fault_reason_strings[MAX_FAULT_REASON_IDX];
+        if (fault_reason >= MAX_FAULT_REASON_IDX)
+                return fault_reason_strings[MAX_FAULT_REASON_IDX - 1];
         else
                 return fault_reason_strings[fault_reason];
 }