gh-144012: Check null binary op extend

[aisk]

• Issue: Result is not checked in BINARY_OP_EXTEND #144012

[Fidget-Spinner]

Thanks, does this need backporting?

[aisk]

Thanks, does this need backporting?

I think it should, the 3.14 branch doesn’t check it either:

cpython/Python/bytecodes.c

Lines 825 to 826 in 23e3c0a

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

And 3.13 branch don't have this opcode, so we can just backport it to 3.14.

[miss-islington-app]

Thanks @aisk for the PR, and @Fidget-Spinner for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖

[miss-islington-app]

Sorry, @aisk and @Fidget-Spinner, I could not cleanly backport this to 3.14 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 54bedcf714160c3ecff3103a53f6291a7e1efd27 3.14

[Fidget-Spinner]

@aisk can you please handle the backport? Thank you!

[aisk]

@aisk can you please handle the backport? Thank you!

Will work on this later today.

[bedevere-app]

GH-144038 is a backport of this pull request to the 3.14 branch.