[PATCH 1/4] amd-iommu: fix an off-by-one error in the AMD IOMMU driver.

From: Joerg Roedel
Date: Fri May 22 2009 - 08:07:56 EST


From: Neil Turton <nturton@xxxxxxxxxxxxxx>

[ impact: bugfix ]

The variable amd_iommu_last_bdf holds the maximum bdf of any device
controlled by an IOMMU, so the number of device entries needed is
amd_iommu_last_bdf+1. The function tbl_size used amd_iommu_last_bdf
instead. This would be a problem if the last device were a large
enough power of 2.

Signed-off-by: Neil Turton <nturton@xxxxxxxxxxxxxx>
Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx>
---
arch/x86/kernel/amd_iommu_init.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 8c0be09..35fc965 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -175,7 +175,7 @@ static inline void update_last_devid(u16 devid)
static inline unsigned long tbl_size(int entry_size)
{
unsigned shift = PAGE_SHIFT +
- get_order(amd_iommu_last_bdf * entry_size);
+ get_order(((int)amd_iommu_last_bdf + 1) * entry_size);

return 1UL << shift;
}
--
1.6.3.1


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