CVE request: Linux kernel: net: fib: fib6_add: potential NULL pointer dereference

[P J P <ppandit () redhat com>]

   Hello,

Linux kernel built with the IPv6 protocol(CONFIG_IPv6) along with the IPv6 
source address based routing support(CONFIG_IPV6_SUBTREE) is vulnerable to a 
NULL pointer dereference flaw. It could occur while doing an ioctl(SIOCADDRT) 
call on an IPv6 socket. User would need to have CAP_NET_ADMIN privileges to 
perform such a call.

A user/program with CAP_NET_ADMIN privileges could use this flaw to crash a
system resulting in DoS.

Upstream fix:
-------------
 -> https://git.kernel.org/linus/ae7b4e1f213aa659aedf9c6ecad0bf5f0476e1e2

Reference:
----------
 -> https://bugzilla.redhat.com/show_bug.cgi?id=1039054


Thank you.
--
Prasad J Pandit / Red Hat Security Response Team