| Date | Thu, 30 Apr 2009 09:56:58 -0700 | From | Greg KH <> | Subject | [patch 69/88] KVM: MMU: check for present pdptr shadow page in walk_shadow |
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2.6.28-stable review patch. If anyone has any objections, please let us know.
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(cherry picked from eb64f1e8cd5c3cae912db30a77d062367f7a11a6)
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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- arch/x86/kvm/mmu.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1159,6 +1159,8 @@ static int walk_shadow(struct kvm_shadow 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; }
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