gnrc_sixlowpan_nd: fixed crash when there are no routers

Yonezawa-T2 · Dec 9, 2015 · a87d36a · a87d36a
1 parent 9e5c188
commit a87d36a
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/sys/net/gnrc/network_layer/sixlowpan/nd/gnrc_sixlowpan_nd.c b/sys/net/gnrc/network_layer/sixlowpan/nd/gnrc_sixlowpan_nd.c
@@ -170,6 +170,11 @@ kernel_pid_t gnrc_sixlowpan_nd_next_hop_l2addr(uint8_t *l2addr, uint8_t *l2addr_
         next_hop = gnrc_ndp_internal_default_router();
     }
 
+    /* no routers */
+    if (next_hop == NULL) {
+        return KERNEL_PID_UNDEF;
+    }
+
     /* address resolution of next_hop: https://tools.ietf.org/html/rfc6775#section-5.7 */
     if ((nc_entry == NULL) || (next_hop != dst)) {
         /* get if not gotten from previous check */