dnsproxy: Check GIO channel for NULL before use

Check GIO channel for NULL before using it. Also shut down the GIO channel
so that already pending input will not use the free'd structure.

diff --git a/src/dnsproxy.c b/src/dnsproxy.c
index bfd0e3e..01bcc51 100644 (file)
--- a/src/dnsproxy.c
+++ b/src/dnsproxy.c
@@ -1765,8 +1765,11 @@ static void server_destroy_socket(struct server_data *data)
                data->timeout = 0;
        }
 
-       g_io_channel_unref(data->channel);
-       data->channel = NULL;
+       if (data->channel != NULL) {
+               g_io_channel_shutdown(data->channel, TRUE, NULL);
+               g_io_channel_unref(data->channel);
+               data->channel = NULL;
+       }
 
        g_free(data->incoming_reply);
        data->incoming_reply = NULL;
@@ -1777,7 +1780,8 @@ static void destroy_server(struct server_data *server)
        GList *list;
 
        DBG("interface %s server %s sock %d", server->interface, server->server,
-               g_io_channel_unix_get_fd(server->channel));
+                       server->channel != NULL ?
+                       g_io_channel_unix_get_fd(server->channel): -1);
 
        server_list = g_slist_remove(server_list, server);
        server_destroy_socket(server);