Bug 736149 - dhclient coredumps when the system has interface with NULL ifa_addr
Summary: dhclient coredumps when the system has interface with NULL ifa_addr
Status: CLOSED DUPLICATE of bug 731990
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: dhcp
Version: 6.1
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: ---
Assignee: Jiri Popelka
QA Contact: Release Test Team
Depends On:
TreeView+ depends on / blocked
Reported: 2011-09-06 19:58 UTC by Konstantin Volkov
Modified: 2011-09-07 08:59 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2011-09-07 08:59:35 UTC

Attachments (Terms of Use)

Description Konstantin Volkov 2011-09-06 19:58:00 UTC
Description of problem:

dhclient coredumps when the system has interface with NULL ifa_addr

[root@localhost ~]# ifconfig venet0
venet0    Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
[root@localhost client]# gdb --args ./dhclient eth0
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-48.el6)
Copyright (C) 2010 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.
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For bug reporting instructions, please see:
Reading symbols from /root/rpmbuild/BUILD/dhcp-4.1.1-P1/client/dhclient...done.
(gdb) run
Starting program: /root/rpmbuild/BUILD/dhcp-4.1.1-P1/client/dhclient eth0
Detaching after fork from child process 32611.
-1207741920 -1207741892
-1207741764 0

Program received signal SIGSEGV, Segmentation fault.
0xb7fb1c0f in get_hw_addr (info=0xb800c608) at lpf.c:639

the similar BUG: https://bugzilla.redhat.com/show_bug.cgi?id=731999

after this patch:

[root@localhost dhcp-4.1.1-P1]# diff -u ./common/lpf.c.orig ./common/lpf.c
--- ./common/lpf.c.orig 2011-09-06 23:49:26.000000000 +0400
+++ ./common/lpf.c      2011-09-06 23:49:48.000000000 +0400
@@ -634,6 +634,9 @@
        for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
+               if (ifa->ifa_addr == NULL)
+                       continue;
                if (ifa->ifa_addr->sa_family != AF_PACKET)


All is OK

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


How reproducible:


Steps to Reproduce:
1. Run dhclient eth0 inside Virtuozzo or OpenVZ Container
2. Get the SegFault
Actual results:


Expected results:

No SegFault, eth0 get the IP

Please fix.

Comment 2 Jiri Popelka 2011-09-07 08:59:35 UTC
Thank you for the report.
This is duplicate of bug #731990 which would be fixed in forthcoming RHEL-6.2.

*** This bug has been marked as a duplicate of bug 731990 ***

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