Integer overflow in gen_sizeof

[federicovalenso]

Bug report

Bug description:

Overflow happens here.

Similar issue is #126119.

CPython versions tested on:

3.11

Operating systems tested on:

No response

[picnixz]

With #126122, I'm not sure if you can still trigger the overflow. Can you find a PoC with that PR included please?

[picnixz]

Nevermind, I misread the code. The crash can still happen. I'll prepare a PR as well.

[picnixz]

Since the issue is similar, I'll just group it under the same issue number (so I'm closing it as a duplicate although it's not really a duplicate). Thanks for the report!