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iommu: Fix off by one in dmar_get_fault_reason()

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fault_reason - 0x20 == ARRAY_SIZE(irq_remap_fault_reasons) is
one past the end of the array.

Signed-off-by: Dan Carpenter <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: Youquan Song <[email protected]>
Cc: walter harms <[email protected]>
Cc: Suresh Siddha <[email protected]>
Cc: <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Dan Carpenter 2012-05-13 20:09:38 +03:00 • committed by Ingo Molnar
commit fefe1ed139
1 changed files with 2 additions and 2 deletions
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4
drivers/iommu/dmar.c
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@ -1057,8 +1057,8 @@ static const char *irq_remap_fault_reasons[] =
const char *dmar_get_fault_reason(u8 fault_reason, int *fault_type)
{
if (fault_reason >= 0x20 && (fault_reason <= 0x20 +
ARRAY_SIZE(irq_remap_fault_reasons))) {
if (fault_reason >= 0x20 && (fault_reason - 0x20 <
ARRAY_SIZE(irq_remap_fault_reasons))) {
*fault_type = INTR_REMAP;
return irq_remap_fault_reasons[fault_reason - 0x20];
} else if (fault_reason < ARRAY_SIZE(dma_remap_fault_reasons)) {