Don't enable device events when there is no valid filedescriptor.

diff --git a/src/net_setup.c b/src/net_setup.c
index de2d0fe..c643449 100644 (file)
--- a/src/net_setup.c
+++ b/src/net_setup.c
@@ -349,12 +349,14 @@ bool setup_myself(void) {
        if(!setup_device())
                return false;
 
-       event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL);
+       if(device_fd >= 0) {
+               event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL);
 
-       if (event_add(&device_ev, NULL) < 0) {
-               logger(LOG_ERR, "event_add failed: %s", strerror(errno));
-               close_device();
-               return false;
+               if (event_add(&device_ev, NULL) < 0) {
+                       logger(LOG_ERR, "event_add failed: %s", strerror(errno));
+                       close_device();
+                       return false;
+               }
        }
 
        /* Run tinc-up script to further initialize the tap interface */