gh-144986: Fix memory leak in atexit.register() (#144987)

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 (file)
index 0000000..841c375
--- /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 1c901d9124d9cac3e194d3f80414039990f75df6..3ddbbd59a1ef0c3146fe4d4e24ebe656ff40986f 100644 (file)
--- 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;