Jia-Ju Bai <baijiaju1990@xxxxxxxxx> wrote: > When find_table_lock() returns NULL to t, no error return code of > do_update_counters() is assigned. Its -ENOENT. > t = find_table_lock(net, name, &ret, &ebt_mutex); ^^^^^ ret is passed to find_table_lock, which passes it to find_inlist_lock_noload() which will set *ret = -ENOENT for NULL case.