From: Marcelo Tosatti Date: Thu, 14 Jan 2010 19:41:27 +0000 (-0200) Subject: KVM: MMU: bail out pagewalk on kvm_read_guest error X-Git-Tag: v2.6.33-rc6~24^2~5 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=a6085fbaf65ab09bfb5ec8d902d6d21680fe1895;p=~shefty%2Frdma-dev.git 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 --- 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))