Result is not checked in `BINARY_OP_EXTEND`

[aisk]

Bug report

Bug description:

Code:

cpython/Python/bytecodes.c

Line 840 in 63cc125

PyObject *res_o = d->action(left_o, right_o);

Previous discussion: https://github.com/python/cpython/pull/144006/changes/acd784a95851fc0c63c1c2f718420a43d6fc6d4a..8e1bcaa84cbdd4ac446b11453ddedadb34ef11f2#r2702550535

CPython versions tested on:

CPython main branch, 3.14, 3.15

Operating systems tested on:

No response

Linked PRs

• gh-144012: Check null binary op extend #144014
• [3.14] gh-144012: Check null binary op extend (GH-144014) #144038