Description of problem:

dhcrelay segfaults on first received packet.

Version-Release number of selected component (if applicable):

# rpm -q dhcp
dhcp-4.1.1-9.fc12.x86_64

How reproducible:

100%

Steps to Reproduce:

The system in question is a gateway between two networks. The first network ("home") is 192.168.1.0/24 and the second ("lab.home") 192.168.2.0/24. eth0 is connected to "home" with IP address 192.168.1.4, eth1 is connected to "lab.home" with IP address 192.168.2.1. My DHCP server is at 192.168.1.5 ("sheeva.home"). I want to make DHCP services available to the "lab.home" network via dhcrelay running on the gateway. /etc/sysconfig/dhcrelay contains:

# cat /etc/sysconfig/dhcrelay 
# Command line options here
INTERFACES="eth1"
DHCPSERVERS="sheeva.home"

When i run a dhclient on a system on the lab.home network, dhcrelay immediately 

Additional info:

[root@master ~]# gdb dhcrelay
GNU gdb (GDB) Fedora (7.0.1-37.fc12)
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/sbin/dhcrelay...Reading symbols from /usr/lib/debug/usr/sbin/dhcrelay.debug...done.
done.
(gdb) set args -d -i eth1 sheeva.home
(gdb) r
Starting program: /usr/sbin/dhcrelay -d -i eth1 sheeva.home
Internet Systems Consortium DHCP Relay Agent 4.1.1
Copyright 2004-2010 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/eth1/00:1b:21:35:62:1e
Sending on   LPF/eth1/00:1b:21:35:62:1e
Sending on   Socket/fallback

Program received signal SIGSEGV, Segmentation fault.
0x0000000000409f37 in do_relay4 (ip=<value optimized out>, packet=0x7fffffffcfe0, length=300, 
    from_port=<value optimized out>, from=..., hfrom=<value optimized out>) at dhcrelay.c:660
660			packet->giaddr = ip->addresses[0];
(gdb) bt
#0  0x0000000000409f37 in do_relay4 (ip=<value optimized out>, packet=0x7fffffffcfe0, length=300, 
    from_port=<value optimized out>, from=..., hfrom=<value optimized out>) at dhcrelay.c:660
#1  0x00000000004118a5 in got_one (h=0x86d960) at discover.c:1396
#2  0x000000000043cf6b in omapi_one_dispatch (wo=<value optimized out>, t=<value optimized out>)
    at dispatch.c:520
#3  0x000000000041388a in dispatch () at dispatch.c:92
#4  0x0000000000408621 in main (argc=<value optimized out>, argv=<value optimized out>) at dhcrelay.c:549