dhcpv6: fix mac-handling

diff --git a/src/dhcpv6-ia.c b/src/dhcpv6-ia.c
index d301b4f0b5b83f01d1df6c1c91c174ef331fb97e..30bffbcf0d921e3d8638254c08c2ebef01cc508a 100644 (file)
--- a/src/dhcpv6-ia.c
+++ b/src/dhcpv6-ia.c
@@ -92,14 +92,15 @@ int setup_dhcpv6_ia_interface(struct interface *iface, bool enable)
                struct lease *lease;
                list_for_each_entry(lease, &leases, head) {
                        // Construct entry
-                       struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + lease->duid_len);
+                       size_t duid_len = lease->duid_len ? lease->duid_len : 14;
+                       struct dhcpv6_assignment *a = calloc(1, sizeof(*a) + duid_len);
                        if (!a) {
                                syslog(LOG_ERR, "Calloc failed for static lease assignment on interface %s",
                                        iface->ifname);
                                return -1;
                        }
 
-                       a->clid_len = lease->duid_len;
+                       a->clid_len = duid_len;
                        a->length = 128;
                        if (lease->hostid) {
                                a->assigned = lease->hostid;