https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110147
Bug ID: 110147
Summary: UBSAN error in rust-demangle.c: NULL pointer passed to
memcpy
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: demangler
Assignee: unassigned at gcc dot gnu.org
Reporter: lukas.dresel at cs dot ucsb.edu
Target Milestone: ---
This was discovered using our hybrid fuzzer originally on `binutils` `nm-new`.
It appears to be caused by passing the string "_RYC0.vdj\\lc[kniso,bz" to
`rust_demangle`.
In the second invocation of `str_buf_append`, the `memcpy` src pointer is set
to NULL.
I have added the attached `nm-new` binary with debug symbols which exhibits the
error, and the reproducing testcase. The above string was extracted from gdb.
