jail: unnamed jails can not have netns (fix segfault)

Signed-off-by: Leonardo Mörlein <me@irrelefant.net>

diff --git a/jail/jail.c b/jail/jail.c
index 67d4cadd4f2d887f5a77da04081d9ddbd098423e..a52c264c3fc2f90587541b6db1eb0b9557b56091 100644 (file)
--- a/jail/jail.c
+++ b/jail/jail.c
@@ -841,6 +841,10 @@ int main(int argc, char **argv)
                }
 
                if (opts.namespace & CLONE_NEWNET) {
+                       if (!opts.name) {
+                               ERROR("netns needs a named jail\n");
+                               return -1;
+                       }
                        netns_fd = netns_open_pid(jail_process.pid);
                        netns_updown(jail_process.pid, true);
                }