[3.12] gh-120244: Fix re.sub() reference leak (GH-120245) (GH-120265)

(cherry picked from commit 38a25e9560cf0ff0b80d9e90bce793ff24c6e027)

Co-authored-by: neonene <53406459+neonene@users.noreply.github.com>

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 (file)
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 0547390454a30e3cfafd3c8f6e0f7fd813de4d55..8ef35d0658c703e77d2ebd79c2a4aff6039c990b 100644 (file)
--- a/Modules/_sre/sre.c
+++ b/Modules/_sre/sre.c
@@ -1572,6 +1572,7 @@ _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: