segfault when dvdbackup attempts to mirror some non-dvd devices

[Benjamin Drung]

Report from Jerome Leclanche via e-mail:

I don't have a Launchpad account, so I just wanted to let you know
about a segfault when dvdbackup attempts to mirror some non-dvd
devices (cd-rom in this case):

% gdb dvdbackup
GNU gdb (GDB) 8.2
...
(gdb) r --verbose --mirror -i /dev/sr0 -o .
Starting program: /usr/bin/dvdbackup --verbose --mirror -i /dev/sr0 -o .
libdvdread:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.IFO failed
libdvdread:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.BUP failed
libdvdread: Can't open file VIDEO_TS.BUP.
Cannot open Video Manager (VMG) info.
Mirror of DVD failed

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7d7d1e9 in ?? () from /usr/lib/libdvdread.so.4
(gdb) bt
#0 0x00007ffff7d7d1e9 in ?? () from /usr/lib/libdvdread.so.4
#1 0x00007ffff7d7eabb in DVDClose () from /usr/lib/libdvdread.so.4
#2 0x0000555555555924 in ?? ()
#3 0x00007ffff7bdb223 in __libc_start_main () from /usr/lib/libc.so.6
#4 0x0000555555555e6a in ?? ()