lib-auth: Avoid crash after user iteration if connection failed.

diff --git a/src/lib-auth/auth-master.c b/src/lib-auth/auth-master.c
index 38b890214731143eafef65be984ff4fc3fe7739c..4eb6ee9354d06cfea9342ee1e5c406b89746c372 100644 (file)
--- a/src/lib-auth/auth-master.c
+++ b/src/lib-auth/auth-master.c
@@ -699,7 +699,8 @@ auth_master_user_list_init(struct auth_master_connection *conn,
 
        if (auth_master_run_cmd_pre(conn, str_c(str)) < 0)
                ctx->failed = TRUE;
-       io_loop_set_current(conn->prev_ioloop);
+       if (conn->prev_ioloop != NULL)
+               io_loop_set_current(conn->prev_ioloop);
        conn->prefix = DEFAULT_USERDB_LOOKUP_PREFIX;
        return ctx;
 }