bus/driver: dup fds for queued messages

Duplicate all FDs attached to a message when queuing it for sending.
Messages can be queued for arbitrary times, so we cannot rely on
borrowed FDs to be available for long enough.

Reported-by: Camron Carter <[email protected]>
Signed-off-by: David Rheinsberg <[email protected]>

src/bus/driver.c

@@ -524,7 +524,7 @@ static int driver_send_reply_with_fds(Peer *peer, CDVar *var, uint32_t serial, i
         data = NULL;
 
         if (n_fds > 0) {
-                r = fdlist_new_with_fds(&message->fds, fds, n_fds);
+                r = fdlist_new_dup_fds(&message->fds, fds, n_fds);
                 if (r)
                         return error_fold(r);
         }