[3.6] bpo-31271: Fix an assertion failure in io.TextIOWrapper.write. (GH-3201) (#3209)

(cherry picked from commit a5b4ea1)

Author: orenmn

Lib/test/test_io.py

@@ -3163,6 +3163,14 @@ def test_read_nonbytes(self):
  t = self.TextIOWrapper(self.StringIO('a'))
  self.assertRaises(TypeError, t.read)
 
+ def test_illegal_encoder(self):
+ # Issue 31271: Calling write() while the return value of encoder's
+ # encode() is invalid shouldn't cause an assertion failure.
+ rot13 = codecs.lookup("rot13")
+ with support.swap_attr(rot13, '_is_text_encoding', True):
+ t = io.TextIOWrapper(io.BytesIO(b'foo'), encoding="rot13")
+ self.assertRaises(TypeError, t.write, 'bar')
+
  def test_illegal_decoder(self):
  # Issue #17106
  # Bypass the early encoding check added in issue 20404

Misc/NEWS.d/next/Core and Builtins/2017-08-25-20-43-22.bpo-31271.YMduKF.rst

@@ -0,0 +1,2 @@
+Fix an assertion failure in the write() method of `io.TextIOWrapper`, when
+the encoder doesn't return a bytes object. Patch by Oren Milman.

Modules/_io/textio.c

@@ -1331,6 +1331,13 @@ _io_TextIOWrapper_write_impl(textio *self, PyObject *text)
  Py_DECREF(text);
  if (b == NULL)
  return NULL;
+ if (!PyBytes_Check(b)) {
+ PyErr_Format(PyExc_TypeError,
+ "encoder should return a bytes object, not '%.200s'",
+ Py_TYPE(b)->tp_name);
+ Py_DECREF(b);
+ return NULL;
+ }
 
  if (self->pending_bytes == NULL) {
  self->pending_bytes = PyList_New(0);