Index: Objects/unicodeobject.c
===================================================================
--- Objects/unicodeobject.c	(revision 66051)
+++ Objects/unicodeobject.c	(working copy)
@@ -1357,8 +1357,8 @@
         PyOS_snprintf(msg, sizeof(msg),
                       "encoder %s returned buffer instead of bytes",
                       encoding);
+        Py_DECREF(v);
         if (PyErr_WarnEx(PyExc_RuntimeWarning, msg, 1) < 0) {
-            v = NULL;
             goto onError;
         }
         v = PyBytes_FromStringAndSize(PyByteArray_AS_STRING(v), Py_SIZE(v));
@@ -1367,7 +1367,8 @@
         PyErr_Format(PyExc_TypeError,
                      "encoder did not return a bytes object (type=%.400s)",
                      Py_TYPE(v)->tp_name);
-        v = NULL;
+        Py_DECREF(v);
+		goto onError;
     }
     return v;