Fix NULL pointer dereference in send_udp_info

[tinc] / src / protocol_misc.c

diff --git a/src/protocol_misc.c b/src/protocol_misc.c
index 95bd322..5bbdc6c 100644 (file)
--- a/src/protocol_misc.c
+++ b/src/protocol_misc.c
@@ -194,6 +194,11 @@ bool send_udp_info(node_t *from, node_t *to) {
           farther than the static relay. */
        to = (to->via == myself) ? to->nexthop : to->via;
 
+       if (to == NULL) {
+               logger(DEBUG_ALWAYS, LOG_ERR, "Something went wrong when selecting relay - possible fake UDP_INFO");
+               return false;
+       }
+
        /* Skip cases where sending UDP info messages doesn't make sense.
           This is done here in order to avoid repeating the same logic in multiple callsites. */