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Problem discovered by Ladislav Józsa.

Steps to Reproduce:
1. dhcpd -d eth1eth1eth1eth1

Actual results:
*** buffer overflow detected ***: dhcpd terminated

Expected results:
eth1eth1eth1eth1: interface name too long

Additional info:
This was supposed to be fixed with bug #441524, comment #3,
but I'm not sure how the patch could have ever worked when the copied string is not null-terminated. It needs also
  tmp->name[sizeof(tmp->name) - 1]= '\0';

Anyway, upstream's approach is to check the length beforehand and exit if it's too long, see attached patch (which fixes also dhcrelay, dhclient is ok).

Created attachment 900331 [details]
fixed IFNAMSIZ.patch

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2014-1406.html