Update

vendor/github.com/fxamacker/cbor/v2/simplevalue.go

@@ -1,3 +1,6 @@
+// Copyright (c) Faye Amacker. All rights reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+
 package cbor
 
 import (
@@ -45,6 +48,9 @@ func (sv SimpleValue) MarshalCBOR() ([]byte, error) {
 }
 
 // UnmarshalCBOR decodes CBOR simple value (major type 7) to SimpleValue.
+//
+// Deprecated: No longer used by this codec; kept for compatibility
+// with user apps that directly call this function.
 func (sv *SimpleValue) UnmarshalCBOR(data []byte) error {
 	if sv == nil {
 		return errors.New("cbor.SimpleValue: UnmarshalCBOR on nil pointer")
@@ -52,6 +58,29 @@ func (sv *SimpleValue) UnmarshalCBOR(data []byte) error {
 
 	d := decoder{data: data, dm: defaultDecMode}
 
+	// Check well-formedness of CBOR data item.
+	// SimpleValue.UnmarshalCBOR() is exported, so
+	// the codec needs to support same behavior for:
+	// - Unmarshal(data, *SimpleValue)
+	// - SimpleValue.UnmarshalCBOR(data)
+	err := d.wellformed(false, false)
+	if err != nil {
+		return err
+	}
+
+	return sv.unmarshalCBOR(data)
+}
+
+// unmarshalCBOR decodes CBOR simple value (major type 7) to SimpleValue.
+// This function assumes data is well-formed, and does not perform bounds checking.
+// This function is called by Unmarshal().
+func (sv *SimpleValue) unmarshalCBOR(data []byte) error {
+	if sv == nil {
+		return errors.New("cbor.SimpleValue: UnmarshalCBOR on nil pointer")
+	}
+
+	d := decoder{data: data, dm: defaultDecMode}
+
 	typ, ai, val := d.getHead()
 
 	if typ != cborTypePrimitives {