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KVM: MMU: check for present pdptr shadow page in walk_shadow

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walk_shadow assumes the caller verified validity of the pdptr pointer in
question, which is not the case for the invlpg handler.

Fixes oops during Solaris 10 install.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti 2008-12-09 16:07:22 +01:00 committed by Avi Kivity
parent ca9edaee1a
commit eb64f1e8cd
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kvm/mmu.c
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@ -1269,6 +1269,8 @@ static int walk_shadow(struct kvm_shadow_walk *walker,
if (level == PT32E_ROOT_LEVEL) {
shadow_addr = vcpu->arch.mmu.pae_root[(addr >> 30) & 3];
shadow_addr &= PT64_BASE_ADDR_MASK;
if (!shadow_addr)
return 1;
--level;
}