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KVM: nVMX: Set cached_vmcs12 and cached_shadow_vmcs12 NULL after free 

Shall help finding use-after-free bugs earlier.

Suggested-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jan Kiszka 2019-07-21 16:01:36 +02:00 committed by Paolo Bonzini
parent d9a710e5fc
commit c6bf2ae931
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kvm/vmx/nested.c
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@ -234,7 +234,9 @@ static void free_nested(struct kvm_vcpu *vcpu)
vmx->vmcs01.shadow_vmcs = NULL;
}
kfree(vmx->nested.cached_vmcs12);
vmx->nested.cached_vmcs12 = NULL;
kfree(vmx->nested.cached_shadow_vmcs12);
vmx->nested.cached_shadow_vmcs12 = NULL;
/* Unpin physical memory we referred to in the vmcs02 */
if (vmx->nested.apic_access_page) {
kvm_release_page_dirty(vmx->nested.apic_access_page);