Bug report

Bug description:

In the load_build function of Modules/_pickle.c, if setting a value in a dictionary fails, the dict variable does not have its reference counter decreased.

Pull request was made at #126990

CPython versions tested on:

3.11

Operating systems tested on:

Linux

Linked PRs

• gh-126991: Fix reference leak in _pickle.c's load_build #126990
• [3.13] gh-126991: Fix reference leak in loading pickle's opcode BUILD (GH-126990) #127018
• [3.12] gh-126991: Fix reference leak in loading pickle's opcode BUILD (GH-126990) #127019
• gh-126991: Add tests for unpickling bad object state #127031
• [3.13] gh-126991: Add tests for unpickling bad object state (GH-127031) #127063
• [3.12] gh-126991: Add tests for unpickling bad object state (GH-127031) #127064