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authorMarcelo Tosatti <mtosatti@redhat.com>2008-11-25 17:33:10 +0300
committerAvi Kivity <avi@redhat.com>2008-11-26 13:34:27 +0300
commit6c475352e87224a8f0b8cc6f6cc96b30563dc5b4 (patch)
tree1046e74c244c3db4673fb937af8b56875405114c /drivers/net
parentc30f8a6c6d74f67bc2107726cc61a1e7c71e9740 (diff)
downloadlinux-6c475352e87224a8f0b8cc6f6cc96b30563dc5b4.tar.xz
KVM: MMU: avoid creation of unreachable pages in the shadow
It is possible for a shadow page to have a parent link pointing to a freed page. When zapping a high level table, kvm_mmu_page_unlink_children fails to remove the parent_pte link. For that to happen, the child must be unreachable via the shadow tree, which can happen in shadow_walk_entry if the guest pte was modified in between walk() and fetch(). Remove the parent pte reference in such case. Possible cause for oops in bug #2217430. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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