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KVM: fix EFER read buffer overflow 

Check whether index is within bounds before grabbing the element.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Avi Kivity <avi@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Roel Kluin 2009-08-04 02:08:45 -07:00 committed by Avi Kivity
parent 1f3ee616dd
commit 3a34a8810b
1 changed files with 5 additions and 2 deletions
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7
arch/x86/kvm/vmx.c
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@ -571,12 +571,15 @@ static void reload_tss(void)
static void load_transition_efer(struct vcpu_vmx *vmx)
{
int efer_offset = vmx->msr_offset_efer;
u64 host_efer = vmx->host_msrs[efer_offset].data;
u64 guest_efer = vmx->guest_msrs[efer_offset].data;
u64 host_efer;
u64 guest_efer;
u64 ignore_bits;
if (efer_offset < 0)
return;
host_efer = vmx->host_msrs[efer_offset].data;
guest_efer = vmx->guest_msrs[efer_offset].data;
/*
* NX is emulated; LMA and LME handled by hardware; SCE meaninless
* outside long mode