Missing PyDECREF calls for ADDITEMS opcode of _pickle.c

[Legoclones]

Bug report

Bug description:

In the load_additems function of Modules/_pickle.c (which handles the ADDITEMS opcode), PyObject_GetAttr is called and returns add_func on line 6660. PyObject_GetAttr returns a new reference, but this reference is never decremented using Py_DECREF, so 2x calls to this function are added (compare to do_append function in the same file).

Pull request was made at #121136

CPython versions tested on:

3.11

Operating systems tested on:

Linux

Linked PRs

• gh-121137: Add missing Py_DECREF calls for ADDITEMS opcode of _pickle.c #121136
• [3.13] gh-121137: Add missing Py_DECREF calls for ADDITEMS opcode of _pickle.c (GH-121136) #121139
• [3.12] gh-121137: Add missing Py_DECREF calls for ADDITEMS opcode of _pickle.c (GH-121136) #121140

[gaogaotiantian]

Thanks for reporting and fixing this.