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KVM: nVMX: fix vmentry failure code when L2 state would require emulation

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Commit 2bb8cafea8 ("KVM: vVMX: signal failure for nested VMEntry if
emulation_required", 2018-03-12) introduces a new error path which does
not set *entry_failure_code.  Fix that to avoid a leak of L0 stack to L1.

Reported-by: Radim Krčmář <rkrcmar@redhat.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-03-21 14:20:18 +01:00
parent e40ff1d660
commit 3184a995f7
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kvm/vmx.c
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@ -11059,8 +11059,10 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
* which means L1 attempted VMEntry to L2 with invalid state. * which means L1 attempted VMEntry to L2 with invalid state.
* Fail the VMEntry. * Fail the VMEntry.
*/ */
if (vmx->emulation_required) if (vmx->emulation_required) {
*entry_failure_code = ENTRY_FAIL_DEFAULT;
return 1; return 1;
}
/* Shadow page tables on either EPT or shadow page tables. */ /* Shadow page tables on either EPT or shadow page tables. */
if (nested_vmx_load_cr3(vcpu, vmcs12->guest_cr3, nested_cpu_has_ept(vmcs12), if (nested_vmx_load_cr3(vcpu, vmcs12->guest_cr3, nested_cpu_has_ept(vmcs12),