check payload len [squash]

Author: joostjager

fat_error_encrypt.go

@@ -72,6 +72,10 @@ func (o *OnionFatErrorEncrypter) addHmacs(data []byte) {
 func (o *OnionFatErrorEncrypter) EncryptError(initial bool, data []byte,
 	payload []byte) ([]byte, error) {
 
+	if len(payload) > o.payloadDataLen {
+		return nil, fmt.Errorf("payload exceeds maximum length")
+	}
+
 	if initial {
 		if len(data) < minOnionErrorLength {
 			return nil, fmt.Errorf(