director: Add assert to make sure USER-MOVE doesn't change tag

diff --git a/src/director/director.c b/src/director/director.c
index 141788c71ff8b8db35e360fc88a0b7c88577c701..777baca029963d13e47261a0c4b2f98318ce8d7c 100644 (file)
--- a/src/director/director.c
+++ b/src/director/director.c
@@ -1062,6 +1062,10 @@ void director_move_user(struct director *dir, struct director_host *src,
                        /* user is already in this host */
                        return;
                }
+               /* user is looked up via the new host's tag, so if it's found
+                  the old tag has to be the same. */
+               i_assert(user->host->tag == host->tag);
+
                user->host->user_count--;
                user->host = host;
                user->host->user_count++;