From 43cd7aa8cd88624f7211e47b98bc1e8e63e7660f Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Thu, 19 Sep 2024 00:11:50 +0200
Subject: [PATCH] gh-120754: Fix memory leak in FileIO.__init__() (#124225)

Free 'self->stat_atopen' before assigning it, since
io.FileIO.__init__() can be called multiple times manually
(especially by test_io).
---
 Modules/_io/fileio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index 865b0e3634f3..8dae465fd20f 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -457,6 +457,7 @@ _io_FileIO___init___impl(fileio *self, PyObject *nameobj, const char *mode,
 #endif
     }
 
+    PyMem_Free(self->stat_atopen);
     self->stat_atopen = PyMem_New(struct _Py_stat_struct, 1);
     if (self->stat_atopen == NULL) {
         PyErr_NoMemory();