[Python-checkins] gh-83004: Clean up refleak in _io initialisation (GH-98840)

[miss-islington]

https://github.com/python/cpython/commit/29c3dc050a4a5e458be7a8966c028bf07502c4b6
commit: 29c3dc050a4a5e458be7a8966c028bf07502c4b6
branch: 3.11
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: miss-islington <31488909+miss-islington at users.noreply.github.com>
date: 2022-11-06T06:03:52-08:00
summary:

gh-83004: Clean up refleak in _io initialisation (GH-98840)

(cherry picked from commit 1208037246eeab4c5c003f1651edfefb045e6fb7)

Co-authored-by: Shantanu <12621235+hauntsaninja at users.noreply.github.com>

files:
A Misc/NEWS.d/next/Library/2022-11-02-05-52-36.gh-issue-83004.LBl79O.rst
M Modules/_io/_iomodule.c

diff --git a/Misc/NEWS.d/next/Library/2022-11-02-05-52-36.gh-issue-83004.LBl79O.rst b/Misc/NEWS.d/next/Library/2022-11-02-05-52-36.gh-issue-83004.LBl79O.rst
new file mode 100644
index 000000000000..4de17abd0634
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-11-02-05-52-36.gh-issue-83004.LBl79O.rst
@@ -0,0 +1 @@
+Clean up refleak on failed module initialisation in :mod:`_io`.
diff --git a/Modules/_io/_iomodule.c b/Modules/_io/_iomodule.c
index 38ef24637b73..a7b2e984310d 100644
--- a/Modules/_io/_iomodule.c
+++ b/Modules/_io/_iomodule.c
@@ -703,10 +703,10 @@ PyInit__io(void)
         goto fail;
 
     /* BlockingIOError, for compatibility */
-    Py_INCREF(PyExc_BlockingIOError);
-    if (PyModule_AddObject(m, "BlockingIOError",
-                           (PyObject *) PyExc_BlockingIOError) < 0)
+    if (PyModule_AddObjectRef(m, "BlockingIOError",
+                              (PyObject *) PyExc_BlockingIOError) < 0) {
         goto fail;
+    }
 
     // Set type base classes
     PyFileIO_Type.tp_base = &PyRawIOBase_Type;