[Xen-changelog] [xen stable-4.3] AMD IOMMU: add missing check

[patchbot@xxxxxxx]

commit 25ec2ee4122167d85c847f51834c787767b96ba1
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Sep 6 14:07:54 2013 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Sep 6 14:07:54 2013 +0200

    AMD IOMMU: add missing check
    
    We shouldn't accept IVHD tables specifying IO-APIC IDs beyond the limit
    we support (MAX_IO_APICS, currently 128).
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Suravee Suthikulpanit <suravee.suthikulapanit@xxxxxxx>
    master commit: 3785d30efe8264b899499e0883b10cc434bd0959
    master date: 2013-08-29 09:31:37 +0200
---
 xen/drivers/passthrough/amd/iommu_acpi.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/xen/drivers/passthrough/amd/iommu_acpi.c 
b/xen/drivers/passthrough/amd/iommu_acpi.c
index 6a2cbb6..330e74f 100644
--- a/xen/drivers/passthrough/amd/iommu_acpi.c
+++ b/xen/drivers/passthrough/amd/iommu_acpi.c
@@ -671,6 +671,13 @@ static u16 __init parse_ivhd_device_special(
             if ( IO_APIC_ID(apic) != special->handle )
                 continue;
 
+            if ( special->handle >= ARRAY_SIZE(ioapic_sbdf) )
+            {
+                printk(XENLOG_ERR "IVHD Error: IO-APIC %#x entry beyond 
bounds\n",
+                       special->handle);
+                return 0;
+            }
+
             if ( ioapic_sbdf[special->handle].pin_setup )
             {
                 if ( ioapic_sbdf[special->handle].bdf == bdf &&
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.3

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