On Fri, Jul 12, 2024 at 11:25:54AM GMT, Youling Tang wrote: > From: Youling Tang <tangyouling@xxxxxxxxxx> > > Note that list_lru_from_memcg_idx() may return NULL, so it is necessary > to error handle the return value to avoid triggering NULL pointer > dereference BUG. > > The issue was triggered for discussion [1], > Link [1]: https://lore.kernel.org/linux-bcachefs/84de6cb1-57bd-42f7-8029-4203820ef0b4@xxxxxxxxx/T/#m901bb26cdb1d9d4bacebf0d034f0a5a712cc93a6 I see no explanation for why this is the correct fix, and I doubt it is. What's the real reason for the NULL lru_list_one, and why doesn't this come up on other filesystems?
