diff -r d1b706e57fbe Modules/_io/textio.c
--- a/Modules/_io/textio.c	Thu Apr 23 11:25:41 2015 +0200
+++ b/Modules/_io/textio.c	Thu Apr 23 21:04:07 2015 +0300
@@ -2262,7 +2262,6 @@ static PyObject *
     Py_ssize_t skip_bytes, skip_back;
     PyObject *saved_state = NULL;
     char *input, *input_end;
-    char *dec_buffer;
     Py_ssize_t dec_buffer_len;
     int dec_flags;
 
@@ -2327,14 +2326,24 @@ static PyObject *
         goto fail;
 
 #define DECODER_GETSTATE() do { \
+        PyObject *dec_buffer; \
         PyObject *_state = PyObject_CallMethodObjArgs(self->decoder, \
             _PyIO_str_getstate, NULL); \
         if (_state == NULL) \
             goto fail; \
-        if (!PyArg_ParseTuple(_state, "y#i", &dec_buffer, &dec_buffer_len, &dec_flags)) { \
+        if (!PyArg_ParseTuple(_state, "Oi", &dec_buffer, &dec_flags)) { \
             Py_DECREF(_state); \
             goto fail; \
         } \
+        if (!PyBytes_Check(dec_buffer)) { \
+            PyErr_Format(PyExc_TypeError, \
+                         "decoder getstate() should have returned a bytes " \
+                         "object, not '%.200s'", \
+                         Py_TYPE(dec_buffer)->tp_name); \
+            Py_DECREF(_state); \
+            goto fail; \
+        } \
+        dec_buffer_len = PyBytes_GET_SIZE(dec_buffer); \
         Py_DECREF(_state); \
     } while (0)