VPP crashes when deleting an ARP entry
When attempting to delete an ARP entry on an interface
that hasn't had any ARP entries added yet, VPP was
retrieving an array element at an index that was out of
bounds and trying to dereference it.
@@ -1635,6 +1635,9 @@ vnet_arp_unset_ip4_over_ethernet_internal (vnet_main_t * vnm,
ethernet_arp_ip4_entry_t *e;
ethernet_arp_interface_t *eai;
+ if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
+ return 0;
+
eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
e = arp_entry_find (eai, &args->a.ip4);
@@ -1659,6 +1662,9 @@ vnet_arp_flush_ip4_over_ethernet_internal (vnet_main_t * vnm,
ethernet_arp_ip4_entry_t *e;
ethernet_arp_interface_t *eai;
+ if (vec_len (am->ethernet_arp_by_sw_if_index) <= args->sw_if_index)
+ return 0;
+
eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
e = arp_entry_find (eai, &args->a.ip4);
@@ -1692,6 +1698,7 @@ vnet_arp_populate_ip4_over_ethernet_internal (vnet_main_t * vnm,
ethernet_arp_ip4_entry_t *e;
ethernet_arp_interface_t *eai;
+ vec_validate (am->ethernet_arp_by_sw_if_index, args->sw_if_index);
eai = &am->ethernet_arp_by_sw_if_index[args->sw_if_index];
e = arp_entry_find (eai, &args->a.ip4);
