KVM: nVMX: Fix size checks in vmx_set_nested_state

commit e8ab8d24b488632d07ce5ddb261f1d454114415b upstream.

The size checks in vmx_nested_state are wrong because the calculations
are made based on the size of a pointer to a struct kvm_nested_state
rather than the size of a struct kvm_nested_state.

Reported-by: Felix Wilhelm  <fwilhelm@google.com>
Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Drew Schmitt <dasch@google.com>
Reviewed-by: Marc Orr <marcorr@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Reviewed-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Fixes: 8fcc4b5923af5de58b80b53a069453b135693304
Cc: stable@ver.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index f90b3a94829120a39b5ee785204956ba5f43669f..a4bcac94392c3dc7800ad1d1b2ebb41ac8b5e18a 100644 (file)
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -5407,7 +5407,7 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
                return ret;
 
        /* Empty 'VMXON' state is permitted */
-       if (kvm_state->size < sizeof(kvm_state) + sizeof(*vmcs12))
+       if (kvm_state->size < sizeof(*kvm_state) + sizeof(*vmcs12))
                return 0;
 
        if (kvm_state->vmx.vmcs_pa != -1ull) {
@@ -5451,7 +5451,7 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
            vmcs12->vmcs_link_pointer != -1ull) {
                struct vmcs12 *shadow_vmcs12 = get_shadow_vmcs12(vcpu);
 
-               if (kvm_state->size < sizeof(kvm_state) + 2 * sizeof(*vmcs12))
+               if (kvm_state->size < sizeof(*kvm_state) + 2 * sizeof(*vmcs12))
                        return -EINVAL;
 
                if (copy_from_user(shadow_vmcs12,