This is a note to let you know that I've just added the patch titled bcache: memset on stack variables in bch_btree_check() and bch_sectors_dirty_init() to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: bcache-memset-on-stack-variables-in-bch_btree_check-and-bch_sectors_dirty_init.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 7d6b902ea0e02b2a25c480edf471cbaa4ebe6b3c Mon Sep 17 00:00:00 2001 From: Coly Li <colyli@xxxxxxx> Date: Fri, 27 May 2022 23:28:16 +0800 Subject: bcache: memset on stack variables in bch_btree_check() and bch_sectors_dirty_init() From: Coly Li <colyli@xxxxxxx> commit 7d6b902ea0e02b2a25c480edf471cbaa4ebe6b3c upstream. The local variables check_state (in bch_btree_check()) and state (in bch_sectors_dirty_init()) should be fully filled by 0, because before allocating them on stack, they were dynamically allocated by kzalloc(). Signed-off-by: Coly Li <colyli@xxxxxxx> Link: https://lore.kernel.org/r/20220527152818.27545-2-colyli@xxxxxxx Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/md/bcache/btree.c | 1 + drivers/md/bcache/writeback.c | 1 + 2 files changed, 2 insertions(+) --- a/drivers/md/bcache/btree.c +++ b/drivers/md/bcache/btree.c @@ -2017,6 +2017,7 @@ int bch_btree_check(struct cache_set *c) if (c->root->level == 0) return 0; + memset(&check_state, 0, sizeof(struct btree_check_state)); check_state.c = c; check_state.total_threads = bch_btree_chkthread_nr(); check_state.key_idx = 0; --- a/drivers/md/bcache/writeback.c +++ b/drivers/md/bcache/writeback.c @@ -947,6 +947,7 @@ void bch_sectors_dirty_init(struct bcach return; } + memset(&state, 0, sizeof(struct bch_dirty_init_state)); state.c = c; state.d = d; state.total_threads = bch_btre_dirty_init_thread_nr(); Patches currently in stable-queue which might be from colyli@xxxxxxx are queue-5.15/bcache-memset-on-stack-variables-in-bch_btree_check-and-bch_sectors_dirty_init.patch