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authorMarcelo Tosatti <mtosatti@redhat.com>2010-01-14 17:41:27 -0200
committerGreg Kroah-Hartman <gregkh@suse.de>2010-01-28 15:02:45 -0800
commit493821093f18655d39f16e31264c00b022640701 (patch)
treea98937171fcb17813c95413d284936f97029e336 /arch
parent59cf8545b9b307b15441f07dec587b7774484789 (diff)
downloadlinux-linaro-stable-493821093f18655d39f16e31264c00b022640701.tar.gz
KVM: MMU: bail out pagewalk on kvm_read_guest error
commit a6085fbaf65ab09bfb5ec8d902d6d21680fe1895 upstream. Exit the guest pagetable walk loop if reading gpte failed. Otherwise its possible to enter an endless loop processing the previous present pte. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/paging_tmpl.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 85e12cd6fb48..5fa33255348c 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))