[Bug c/91128] Incomplete fix of heap overflow in cp-demangle.c

[featherrain26 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91128

--- Comment #3 from Shadow HUANG <featherrain26 at gmail dot com> ---
(In reply to Martin Liška from comment #1)
> How did you create the 'input' binary?

I use my fuzzer to create it. It is a new hybrid fuzzing techniques.