net: l2: ppp: ipv6cp: add assert to check the link address length

This ensures that the configured link address is
at least as big as the part of it that is used.

Signed-off-by: Tomi Fontanilles <[email protected]>

Author: tomi-font

subsys/net/l2/ppp/ipv6cp.c

@@ -37,6 +37,7 @@ static int ipv6cp_add_iid(struct ppp_context *ctx, struct net_pkt *pkt)
 	if (linkaddr->len == 8) {
 		memcpy(iid, linkaddr->addr, iid_len);
 	} else {
+		NET_ASSERT(linkaddr->len >= 6);
 		memcpy(iid, linkaddr->addr, 3);
 		iid[3] = 0xff;
 		iid[4] = 0xfe;