jail: netifd: check target netns fd before using it

Make sure filehandler is non-negative before using it.

Coverity CID: 1492888 Negative returns
Signed-off-by: Daniel Golle <daniel@makrotopia.org>

diff --git a/jail/netifd.c b/jail/netifd.c
index f6f2df679451da9d34be824a106de4bf5a795424..0f05ccc2bae0d309b5fb9e2ec1848aca627c0d16 100644 (file)
--- a/jail/netifd.c
+++ b/jail/netifd.c
@@ -469,6 +469,10 @@ int jail_network_start(struct ubus_context *new_ctx, char *new_jail_name, pid_t
        watch_ubus_service();
 
        netns_fd = ns_open_pid("net", ns_pid);
+       if (netns_fd < 0) {
+               ret = ESRCH;
+               goto errout_inotify;
+       }
 
        netns_updown(host_ubus_ctx, jail_name, true, netns_fd);