Description:

I'm running archlinux on a linode, which it's under a virtualized XEN that has no PCI or USB devices. The latest update of libpcap links against libusb and doesn't seems to handle this situation properly as long as it doesn't checks for null pointers..

Additional info:
* package version(s)

libpcap 1.3.0-3
libusb-compat 0.1.4-2
libusbx 1.0.15-1
tcpdump 4.4.0-1
usbutils 006-1


* config and/or log files etc.


Steps to reproduce:

# lsusb
unable to initialize libusb: -99
# tcpdump
Segmentation fault (core dumped)
# gdb tcpdump
(gdb) bt
#0 0x00007ffff7496b50 in __opendirat () from /usr/lib/libc.so.6
#1 0x00007ffff6dc2442 in ?? () from /usr/lib/libusb-1.0.so.0
#2 0x00007ffff6dba88a in libusb_get_device_list () from /usr/lib/libusb-1.0.so.0
#3 0x00007ffff77a1a9f in canusb_platform_finddevs () from /usr/lib/libpcap.so.1
#4 0x00007ffff779ecf4 in pcap_platform_finddevs () from /usr/lib/libpcap.so.1
#5 0x00007ffff77a1e93 in pcap_findalldevs () from /usr/lib/libpcap.so.1
#6 0x00007ffff77a3bd6 in pcap_lookupdev () from /usr/lib/libpcap.so.1
#7 0x00000000004048d9 in ?? ()
#8 0x00007ffff7405a15 in __libc_start_main () from /usr/lib/libc.so.6
#9 0x00000000004050ad in ?? ()
(gdb) disassemble $rip, $rip+20
Dump of assembler code from 0x7ffff7496b50 to 0x7ffff7496b64:
=> 0x00007ffff7496b50 <__opendirat+0>: cmpb $0x0,(%rsi)
0x00007ffff7496b53 <__opendirat+3>: je 0x7ffff7496b7d <__opendirat+45>
0x00007ffff7496b55 <__opendirat+5>: sub $0x8,%rsp
0x00007ffff7496b59 <__opendirat+9>: xor %ecx,%ecx
0x00007ffff7496b5b <__opendirat+11>: mov $0x90800,%edx
0x00007ffff7496b60 <__opendirat+16>: callq 0x7ffff74bcfe0 <__openat_nocancel>
End of assembler dump.
(gdb) print $rsi
$1 = 0