Bug 579382 - dhcrelay segfaults on first packet received
dhcrelay segfaults on first packet received
Product: Fedora
Classification: Fedora
Component: dhcp (Show other bugs)
All Linux
low Severity medium
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Assigned To: Jiri Popelka
Fedora Extras Quality Assurance
Depends On:
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Reported: 2010-04-04 16:28 EDT by Geert Jansen
Modified: 2013-03-13 02:21 EDT (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2010-12-03 11:20:28 EST
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Description Geert Jansen 2010-04-04 16:28:33 EDT
Description of problem:

dhcrelay segfaults on first received packet.

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

# rpm -q dhcp

How reproducible:


Steps to Reproduce:

The system in question is a gateway between two networks. The first network ("home") is and the second ("lab.home") eth0 is connected to "home" with IP address, eth1 is connected to "lab.home" with IP address My DHCP server is at ("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

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:
Reading symbols from /usr/sbin/dhcrelay...Reading symbols from /usr/lib/debug/usr/sbin/dhcrelay.debug...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
Comment 1 Jiri Popelka 2010-04-06 06:16:31 EDT
Thanks for the backtrace.

I already saw this in Bug #547694, comment #1.
I hadn't found (I couldn't reproduce it) where the problem was,
but reporter claimed (Bug #547633, comment #6)
it was fixed in 4.1.1-5.fc12.

I actually have no idea now where the problem can be,
but can you show me what does 'ip addr show' on the gateway.
Comment 2 Bug Zapper 2010-11-03 13:53:06 EDT
This message is a reminder that Fedora 12 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
and issuing updates for Fedora 12.  It is Fedora's policy to close all
bug reports from releases that are no longer maintained.  At that time
this bug will be closed as WONTFIX if it remains open with a Fedora 
'version' of '12'.

Package Maintainer: If you wish for this bug to remain open because you
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Comment 3 Bug Zapper 2010-12-03 11:20:28 EST
Fedora 12 changed to end-of-life (EOL) status on 2010-12-02. Fedora 12 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of 
Fedora please feel free to reopen this bug against that version.

Thank you for reporting this bug and we are sorry it could not be fixed.
Comment 4 Jiri Popelka 2013-03-12 10:28:18 EDT

This has been fixed upstream in ISC dhcp-4.2.2b1 with the following note in changelog:

- Relay no longer crashes, when DHCP packet is received over interface without
  any IPv4 address assigned. [ISC-Bugs #22409]

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