[Bug demangler/99189] cxxfilt may exist a uaf

[zyt1024 at bupt dot edu.cn via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99189

--- Comment #2 from zhangyuntao <zyt1024 at bupt dot edu.cn> ---
Created attachment 50231
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50231&action=edit
PoC