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

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Message-ID: <1242993991-28613-2-git-send-email-joerg.roedel@amd.com>
Date:	Fri, 22 May 2009 14:06:28 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
CC:	Neil Turton <nturton@...arflare.com>,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 1/4] amd-iommu: fix an off-by-one error in the AMD IOMMU driver.

From: Neil Turton <nturton@...arflare.com>

[ 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@...arflare.com>
Signed-off-by: Joerg Roedel <joerg.roedel@....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 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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