[Bug demangler/105039] New: rust demangler stack overflow

[amodra at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105039

            Bug ID: 105039
           Summary: rust demangler stack overflow
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: demangler
          Assignee: unassigned at gcc dot gnu.org
          Reporter: amodra at gmail dot com
  Target Milestone: ---

>From https://sourceware.org/bugzilla/show_bug.cgi?id=28995

c++filt _RYAaca_NRYAaBa_a

AddressSanitizer:DEADLYSIGNAL
=================================================================
==4145846==ERROR: AddressSanitizer: stack-overflow on address 0x7ffd205e8ff8
(pc 0x0000021dfea9 bp 0x00000000005f sp 0x7ffd205e9000 T0)
    #0 0x21dfea9 in peek
/home/alan/src/binutils-gdb/libiberty/rust-demangle.c:90
    #1 0x21dfd8c in eat
/home/alan/src/binutils-gdb/libiberty/rust-demangle.c:99:7
    #2 0x21e1bb4 in parse_integer_62
/home/alan/src/binutils-gdb/libiberty/rust-demangle.c:125:7
    #3 0x21e2019 in demangle_const
/home/alan/src/binutils-gdb/libiberty/rust-demangle.c:1153:17
    #4 0x21e20a7 in demangle_const
/home/alan/src/binutils-gdb/libiberty/rust-demangle.c:1158:11

and lots more at 1158:11.  This is with libiberty sources from gcc commit
4cebae0924248b.