https://github.com/python/cpython/commit/50c14719fbd47f500dd1a468998201d22475126d
commit: 50c14719fbd47f500dd1a468998201d22475126d
branch: main
author: Shamil <[email protected]>
committer: pablogsal <[email protected]>
date: 2026-02-19T20:42:55Z
summary:
gh-144986: Fix memory leak in atexit.register() (#144987)
files:
A Misc/NEWS.d/next/Library/2026-02-19-00-00-00.gh-issue-144986.atexit-leak.rst
M Modules/atexitmodule.c
diff --git
a/Misc/NEWS.d/next/Library/2026-02-19-00-00-00.gh-issue-144986.atexit-leak.rst
b/Misc/NEWS.d/next/Library/2026-02-19-00-00-00.gh-issue-144986.atexit-leak.rst
new file mode 100644
index 00000000000000..841c3758ec4df1
--- /dev/null
+++
b/Misc/NEWS.d/next/Library/2026-02-19-00-00-00.gh-issue-144986.atexit-leak.rst
@@ -0,0 +1,2 @@
+Fix a memory leak in :func:`atexit.register`.
+Patch by Shamil Abdulaev.
diff --git a/Modules/atexitmodule.c b/Modules/atexitmodule.c
index 1c901d9124d9ca..3ddbbd59a1ef0c 100644
--- a/Modules/atexitmodule.c
+++ b/Modules/atexitmodule.c
@@ -185,6 +185,9 @@ atexit_register(PyObject *module, PyObject *args, PyObject
*kwargs)
return NULL;
}
PyObject *func_args = PyTuple_GetSlice(args, 1, PyTuple_GET_SIZE(args));
+ if (func_args == NULL) {
+ return NULL;
+ }
PyObject *func_kwargs = kwargs;
if (func_kwargs == NULL)
@@ -192,6 +195,7 @@ atexit_register(PyObject *module, PyObject *args, PyObject
*kwargs)
func_kwargs = Py_None;
}
PyObject *callback = PyTuple_Pack(3, func, func_args, func_kwargs);
+ Py_DECREF(func_args);
if (callback == NULL)
{
return NULL;
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