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authorJan Kiszka <jan.kiszka@siemens.com>2019-07-21 16:01:36 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2019-07-22 13:55:49 +0200
commitc6bf2ae931adbd3e10967e12142856439a211813 (patch)
treedccbce7d93a788e7b2090dc02fca4f7bd620acc5 /arch
parentd9a710e5fc4941944d565b013414e9fdc66242b5 (diff)
downloadlinux-c6bf2ae931adbd3e10967e12142856439a211813.tar.bz2
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/vmx/nested.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 4cdab4b4eff1..ced9fba32598 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -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);