diff options
| author | Marcelo Tosatti <mtosatti@redhat.com> | 2010-01-14 17:41:27 -0200 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2010-01-25 12:26:38 -0200 |
| commit | a6085fbaf65ab09bfb5ec8d902d6d21680fe1895 (patch) | |
| tree | 78e2ca9d3bc6d2ea81bb01952ef22cc9c17a7c9f /arch/x86 | |
| parent | d72118cecabbb76b96b77107a50c74d1bb36c0c1 (diff) | |
KVM: MMU: bail out pagewalk on kvm_read_guest error
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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/paging_tmpl.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 58a0f1e8859..ede2131a922 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -150,7 +150,9 @@ walk: 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)) |