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KVM: MMU: bail out pagewalk on kvm_read_guest error

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Exit the guest pagetable walk loop if reading gpte failed. Otherwise its
possible to enter an endless loop processing the previous present pte.

Cc: stable@kernel.org
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Marcelo Tosatti 2010-01-14 17:41:27 -02:00
parent d72118ceca
commit a6085fbaf6
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kvm/paging_tmpl.h
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@ -150,7 +150,9 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
walker->table_gfn[walker->level - 1] = table_gfn;
walker->pte_gpa[walker->level - 1] = pte_gpa;
kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte));
if (kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte)))
goto not_present;
trace_kvm_mmu_paging_element(pte, walker->level);
if (!is_present_gpte(pte))