Issue #6242: Fix deallocator of io.StringIO and io.BytesIO.
diff --git a/Modules/_io/stringio.c b/Modules/_io/stringio.c
index 84a15be..d773723 100644
--- a/Modules/_io/stringio.c
+++ b/Modules/_io/stringio.c
@@ -509,11 +509,15 @@
stringio_dealloc(stringio *self)
{
_PyObject_GC_UNTRACK(self);
+ self->ok = 0;
+ if (self->buf) {
+ PyMem_Free(self->buf);
+ self->buf = NULL;
+ }
Py_CLEAR(self->readnl);
Py_CLEAR(self->writenl);
Py_CLEAR(self->decoder);
- if (self->buf)
- PyMem_Free(self->buf);
+ Py_CLEAR(self->dict);
if (self->weakreflist != NULL)
PyObject_ClearWeakRefs((PyObject *) self);
Py_TYPE(self)->tp_free(self);