This is a note to let you know that I've just added the patch titled mm/memcontrol.c: add missed css_put() to the 5.4-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: mm-memcontrol.c-add-missed-css_put.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 3a98990ae2150277ed34d3b248c60e68bf2244b2 Mon Sep 17 00:00:00 2001 From: Muchun Song <songmuchun@xxxxxxxxxxxxx> Date: Thu, 25 Jun 2020 20:30:19 -0700 Subject: mm/memcontrol.c: add missed css_put() From: Muchun Song <songmuchun@xxxxxxxxxxxxx> commit 3a98990ae2150277ed34d3b248c60e68bf2244b2 upstream. We should put the css reference when memory allocation failed. Link: http://lkml.kernel.org/r/20200614122653.98829-1-songmuchun@xxxxxxxxxxxxx Fixes: f0a3a24b532d ("mm: memcg/slab: rework non-root kmem_cache lifecycle management") Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx> Acked-by: Roman Gushchin <guro@xxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx> Cc: Qian Cai <cai@xxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- mm/memcontrol.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2895,8 +2895,10 @@ static void memcg_schedule_kmem_cache_cr return; cw = kmalloc(sizeof(*cw), GFP_NOWAIT | __GFP_NOWARN); - if (!cw) + if (!cw) { + css_put(&memcg->css); return; + } cw->memcg = memcg; cw->cachep = cachep; Patches currently in stable-queue which might be from songmuchun@xxxxxxxxxxxxx are queue-5.4/mm-memcontrol.c-add-missed-css_put.patch