Check if devops is valid before closing the device.

This fixes a segfault that occurs on exit if tinc fails before the
device is initialized (for example, if it fails to read the private
key).

diff --git a/src/net_setup.c b/src/net_setup.c
index 96a7224..d83c572 100644 (file)
--- a/src/net_setup.c
+++ b/src/net_setup.c
@@ -1141,7 +1141,8 @@ void close_network_connections(void) {
 
        if (device_fd >= 0)
                io_del(&device_io);
-       devops.close();
+       if (devops.close)
+               devops.close();
 
        exit_control();