[gutsy] dhelp_parse -r dumps core (called in postinst, fails to install/upgrade)

Binary package hint: dhelp
Architecture: amd64

Unpacking dhelp (from .../dhelp_0.5.24-0.1_amd64.deb) ...
Setting up dhelp (0.5.24-0.1) ...
Building HTML tree ...*** stack smashing detected ***: /usr/sbin/dhelp_parse terminated
Aborted (core dumped)
dpkg: error processing dhelp (--configure):
 subprocess post-installation script returned error exit status 134
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install. Trying to recover:
Setting up dhelp (0.5.24-0.1) ...
Building HTML tree ...*** stack smashing detected ***: /usr/sbin/dhelp_parse terminated
Aborted (core dumped)
dpkg: error processing dhelp (--configure):
 subprocess post-installation script returned error exit status 134
Errors were encountered while processing:
 dhelp

(gdb) run -r
Starting program: /usr/sbin/dhelp_parse -r
[Thread debugging using libthread_db enabled]
[New Thread 47239266745072 (LWP 10012)]
*** stack smashing detected ***: /usr/sbin/dhelp_parse terminated

Program received signal SIGABRT, Aborted.
[Switching to Thread 47239266745072 (LWP 10012)]
0x00002af6bf626765 in raise () from /lib/libc.so.6
(gdb) bt
#0 0x00002af6bf626765 in raise () from /lib/libc.so.6
#1 0x00002af6bf6281c0 in abort () from /lib/libc.so.6
#2 0x00002af6bf65f60b in ?? () from /lib/libc.so.6
#3 0x00002af6bf6de21c in __stack_chk_fail () from /lib/libc.so.6
#4 0x00000000004018e2 in dhelp_add (
    name=0x7fffeb9fcdb0 "/usr/share/doc/bzip2/") at dhelp_parse.c:695
#5 0x0000000000401a06 in dhelp_add_rec (
    dirname=0x7fffeb9fde80 "/usr/share/doc/bzip2") at dhelp_parse.c:758
#6 0x0000000000401a48 in dhelp_add_rec (
    dirname=0x7fffeb9feec0 "/usr/share/doc") at dhelp_parse.c:755
#7 0x0000000000402897 in main (argc=2, argv=0x7fffeba00fe8)
    at dhelp_parse.c:794
#8 0x00002af6bf612b44 in __libc_start_main () from /lib/libc.so.6
#9 0x0000000000400de9 in _start ()

pkern@asterix:~$ dpkg -s bzip2|grep '^Version'
Version: 1.0.4-0ubuntu1