crash bug in the demangle part of liberty

["Kipp E.B. Hickman" <kipp@netscape.com>]

Here is the test case. On my redhat6.0 system with
binutils-2.9.1.0.23-1, it core dumps on me...

% cat dem.cpp
#include <stdio.h>

extern "C" {
  char *cplus_demangle (const char *mangled, int options);
}

int main(int argc, char** argv)
{
  char* s =
"__thunk_4_HandleUnknownContentType__15nsBrowserWindowP17nsIDocumentLoaderP10nsIChannelPCcT3";

  char* dm = cplus_demangle(s, 1);
  if (dm) {
    printf("in: '%s'\n", s);
    printf("out: '%s'\n", dm);
  }
  return 0;
}

% gdb dem
GNU gdb 4.17.0.11 with Linux support
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This GDB was configured as "i386-redhat-linux"...
(gdb) run
Starting program: /home/kipp/src/dem

Program received signal SIGSEGV, Segmentation fault.
chunk_free (ar_ptr=0x850f003a, p=0x4015f588) at malloc.c:2958
malloc.c:2958: No such file or directory.
(gdb) bt
#0  chunk_free (ar_ptr=0x850f003a, p=0x4015f588) at malloc.c:2958
#1  0x400cf505 in __libc_free (mem=0x4015f590) at malloc.c:2932
#2  0x804c863 in string_delete (s=0x804ec10)
    at ../../../libiberty/cplus-dem.c:3577
#3  0x8049400 in mop_up (work=0xbffff850, declp=0xbffff82c, success=1)
    at ../../../libiberty/cplus-dem.c:749
#4  0x8049328 in internal_cplus_demangle (work=0xbffff850,
    mangled=0x804cc3b "") at ../../../libiberty/cplus-dem.c:690
#5  0x8049221 in cplus_demangle (
    mangled=0x804cbe0
"__thunk_4_HandleUnknownContentType__15nsBrowserWindowP17n
sIDocumentLoaderP10nsIChannelPCcT3", options=1)
    at ../../../libiberty/cplus-dem.c:625
#6  0x8048c18 in main ()
#7  0x4008ecb3 in __libc_start_main (main=0x8048c00 <main>, argc=1,
    argv=0xbffff904, init=0x80489a0 <_init>, fini=0x804cb8c <_fini>,
    rtld_fini=0x4000a350 <_dl_fini at dl-fini.c:25>,
stack_end=0xbffff8fc)
    at ../sysdeps/generic/libc-start.c:78

--
-----------------------------------------------------------------------
Kipp E.B. Hickman       <><
kipp@netscape.com       http://home.netscape.com/people/kipp/index.html