From 29c3dc050a4a5e458be7a8966c028bf07502c4b6 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Sun, 6 Nov 2022 06:03:52 -0800
Subject: gh-83004: Clean up refleak in _io initialisation (GH-98840)

(cherry picked from commit 1208037246eeab4c5c003f1651edfefb045e6fb7)

Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>
---
 .../next/Library/2022-11-02-05-52-36.gh-issue-83004.LBl79O.rst      | 1 +
 Modules/_io/_iomodule.c                                             | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2022-11-02-05-52-36.gh-issue-83004.LBl79O.rst

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 0000000..4de17ab
--- /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 38ef246..a7b2e98 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;
-- 
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