2 files changed, 9 insertions, 0 deletions
diff --git a/Modules/_io/bufferedio.c b/Modules/_io/bufferedio.c
index b8043d4..86f7412 100644
--- a/Modules/_io/bufferedio.c
+++ b/Modules/_io/bufferedio.c
@@ -2307,6 +2307,11 @@ bufferedrwpair_isatty(rwpair *self, PyObject *args)
 static PyObject *
 bufferedrwpair_closed_get(rwpair *self, void *context)
 {
+    if (self->writer == NULL) {
+        PyErr_SetString(PyExc_RuntimeError,
+                "the BufferedRWPair object is being garbage-collected");
+        return NULL;
+    }
     return PyObject_GetAttr((PyObject *) self->writer, _PyIO_str_closed);
 }
 
diff --git a/Modules/_io/stringio.c b/Modules/_io/stringio.c
index c40163f..a4536b1 100644
--- a/Modules/_io/stringio.c
+++ b/Modules/_io/stringio.c
@@ -131,6 +131,10 @@ write_str(stringio *self, PyObject *obj)
         return -1;
 
     assert(PyUnicode_Check(decoded));
+    if (PyUnicode_READY(decoded)) {
+        Py_DECREF(decoded);
+        return -1;
+    }
     len = PyUnicode_GET_LENGTH(decoded);
 
     assert(len >= 0);