Possible dereference of NULL

[VoroninArtemii]

There is a possible dereference of iflist = NULL inside linux_freeinternalnameindex because since we are allocating memory but it may fail:

net-snmp/agent/mibgroup/mibII/ipv6.c

Lines 2682 to 2691 in 3c0642b

	tmp =
	realloc(iflist,
	(sizeof(struct if_nameindex)) * (last_if_count +
	2));
	if (!tmp) {
	linux_freeinternalnameindex(iflist, if_index);
	if_count = 0;
	iflist = NULL;
	break;
	}

Found by Linux Verification Center (portal.linuxtesting.ru) with SVACE.
Author A. Voronin.