From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: [patch 21/32] mm/memcontrol.c: add missed css_put() Date: Thu, 25 Jun 2020 20:30:19 -0700 Message-ID: <20200626033019.-e_OxsAHA%akpm@linux-foundation.org> References: <20200625202807.b630829d6fa55388148bee7d@linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from mail.kernel.org ([198.145.29.99]:48582 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728333AbgFZDaU (ORCPT ); Thu, 25 Jun 2020 23:30:20 -0400 In-Reply-To: <20200625202807.b630829d6fa55388148bee7d@linux-foundation.org> Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: akpm@linux-foundation.org, cai@lca.pw, guro@fb.com, hannes@cmpxchg.org, mhocko@suse.com, mm-commits@vger.kernel.org, songmuchun@bytedance.com, stable@vger.kernel.org, torvalds@linux-foundation.org, vdavydov.dev@gmail.com From: Muchun Song Subject: mm/memcontrol.c: add missed css_put() We should put the css reference when memory allocation failed. Link: http://lkml.kernel.org/r/20200614122653.98829-1-songmuchun@bytedance.com Fixes: f0a3a24b532d ("mm: memcg/slab: rework non-root kmem_cache lifecycle management") Signed-off-by: Muchun Song Acked-by: Roman Gushchin Acked-by: Michal Hocko Cc: Johannes Weiner Cc: Vladimir Davydov Cc: Qian Cai Cc: Signed-off-by: Andrew Morton --- mm/memcontrol.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/mm/memcontrol.c~mm-memcontrol-fix-do-not-put-the-css-reference +++ a/mm/memcontrol.c @@ -2772,8 +2772,10 @@ 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; _