linux-kernel - [PATCH] Fixed an off-by-one error in the AMD IOMMU driver.

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Date:	Thu, 14 May 2009 14:00:35 +0100
From:	Neil Turton <nturton@...arflare.com>
To:	"Roedel, Joerg" <Joerg.Roedel@....com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	iommu@...ts.linux-foundation.org
Subject: [PATCH] Fixed an off-by-one error in the AMD IOMMU driver.

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@...arflare.com>
---
 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 42c33ce..61479ba 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;
 }
-- 
1.5.5
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