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The same issue on rhel-6.

iproute-2.6.32-45.el6

+++ This bug was initially created as a clone of Bug #1277094 +++

Description of problem:

ip neighbour segfaults if bad mac address is used.

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

iproute-3.10.0-54.el7

How reproducible:

100%

Steps to Reproduce:

# ip link add test-iface type dummy
# ip link set test-iface up
# ip neigh add 192.168.100.3 lladdr 00:c0:7b:7d:00:c10 dev test-iface nud reachable
"c10" is invalid lladdr.
Segmentation fault
# ip link del test-iface

Actual results:

There is segfaults.

Expected results:

No segfaults.

Additional info:

Successfully reproduced in my local RHEL6 VM.

The following upstream commit fixes the issue:

commit 542b0cc759c6d3456d16c05c886b367e1b2f1e73
Author: Stephen Hemminger <shemming>
Date:   Tue Jan 13 18:06:16 2015 -0800

    neighbor: check return values
    
    Need to check for invalid address and buffer overrun in ip neigh
    command with invalid paramters.

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.

https://rhn.redhat.com/errata/RHBA-2016-0895.html