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

Author: ashm-dev

Modules/atexitmodule.c

@@ -185,13 +185,17 @@ 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)
     {
         func_kwargs = Py_None;
     }
     PyObject *callback = PyTuple_Pack(3, func, func_args, func_kwargs);
+    Py_DECREF(func_args);
     if (callback == NULL)
     {
         return NULL;

Parser/action_helpers.c

@@ -1683,7 +1683,7 @@ _build_concatenated_bytes(Parser *p, asdl_expr_seq *strings, int lineno,
         Py_DECREF(res);
         return NULL;
     }
-    return _PyAST_Constant(res, kind, lineno, col_offset, end_lineno, end_col_offset, p->arena);
+    return _PyAST_Constant(res, kind, lineno, col_offset, end_lineno, end_col_offset, arena);
 }
 
 static expr_ty
@@ -1724,7 +1724,7 @@ _build_concatenated_unicode(Parser *p, asdl_expr_seq *strings, int lineno,
     if (final == NULL) {
         return NULL;
     }
-    if (_PyArena_AddPyObject(p->arena, final) < 0) {
+    if (_PyArena_AddPyObject(arena, final) < 0) {
         Py_DECREF(final);
         return NULL;
     }
@@ -1895,7 +1895,7 @@ _build_concatenated_joined_str(Parser *p, asdl_expr_seq *strings,
 {
     asdl_expr_seq *values = _build_concatenated_str(p, strings, lineno,
         col_offset, end_lineno, end_col_offset, arena);
-    return _PyAST_JoinedStr(values, lineno, col_offset, end_lineno, end_col_offset, p->arena);
+    return _PyAST_JoinedStr(values, lineno, col_offset, end_lineno, end_col_offset, arena);
 }
 
 expr_ty