Possible dereference of NULL

[Artemii Voronin]

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.