linux-kernel - [PATCH 3/4] amd-iommu: make sure only ivmd entries are parsed

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Message-ID: <1242993991-28613-4-git-send-email-joerg.roedel@amd.com>
Date:	Fri, 22 May 2009 14:06:30 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
CC:	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 3/4] amd-iommu: make sure only ivmd entries are parsed

[ impact: protect against broken ivrs acpi table ]

The bug never triggered. But it should be fixed to protect against
broken ACPI tables in the future.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kernel/amd_iommu_init.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 53f93db..a3a2b98 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -906,6 +906,8 @@ static int __init init_unity_map_range(struct ivmd_header *m)
 
 	switch (m->type) {
 	default:
+		kfree(e);
+		return 0;
 	case ACPI_IVMD_TYPE:
 		e->devid_start = e->devid_end = m->devid;
 		break;
-- 
1.6.3.1


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