From 9b704ceecae28d73a0315c3fd5547cf09b2d85a4 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Sat, 8 Jun 2024 13:10:28 +0200
Subject: [3.13] gh-120244: Fix re.sub() reference leak (GH-120245) (GH-120264)

(cherry picked from commit 38a25e9560cf0ff0b80d9e90bce793ff24c6e027)

Co-authored-by: neonene <53406459+neonene@users.noreply.github.com>
---
 Misc/NEWS.d/next/Library/2024-06-08-09-45-31.gh-issue-120244.8o9Dzr.rst | 1 +
 Modules/_sre/sre.c                                                      | 1 +
 2 files changed, 2 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2024-06-08-09-45-31.gh-issue-120244.8o9Dzr.rst

diff --git a/Misc/NEWS.d/next/Library/2024-06-08-09-45-31.gh-issue-120244.8o9Dzr.rst b/Misc/NEWS.d/next/Library/2024-06-08-09-45-31.gh-issue-120244.8o9Dzr.rst
new file mode 100644
index 0000000..d21532f
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-06-08-09-45-31.gh-issue-120244.8o9Dzr.rst
@@ -0,0 +1 @@
+Fix memory leak in :func:`re.sub()` when the replacement string contains backreferences.
diff --git a/Modules/_sre/sre.c b/Modules/_sre/sre.c
index c1eff63..e330340 100644
--- a/Modules/_sre/sre.c
+++ b/Modules/_sre/sre.c
@@ -1622,6 +1622,7 @@ _sre_template_impl(PyObject *module, PyObject *pattern, PyObject *template)
         }
         self->items[i].literal = Py_XNewRef(literal);
     }
+    PyObject_GC_Track(self);
     return (PyObject*) self;
 
 bad_template:
-- 
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