releases/4.14.194/cgroup-add-missing-skcd-no_refcnt-check-in-cgroup_sk.patch

   1 From 9806f80403337066a2c9c48d1c595f5ad8e7be76 Mon Sep 17 00:00:00 2001
   2 From: Sasha Levin <sashal@kernel.org>
   3 Date: Thu, 13 Aug 2020 20:29:16 +0000
   4 Subject: cgroup: add missing skcd->no_refcnt check in cgroup_sk_clone()
   5
   6 From: Yang Yingliang <yangyingliang@huawei.com>
   7
   8 Add skcd->no_refcnt check which is missed when backporting
   9 ad0f75e5f57c ("cgroup: fix cgroup_sk_alloc() for sk_clone_lock()").
  10
  11 This patch is needed in stable-4.9, stable-4.14 and stable-4.19.
  12
  13 Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
  14 Signed-off-by: Sasha Levin <sashal@kernel.org>
  15 ---
  16  kernel/cgroup/cgroup.c | 2 ++
  17  1 file changed, 2 insertions(+)
  18
  19 diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
  20 index a2fed8fbd2bde..ada060e628ce3 100644
  21 --- a/kernel/cgroup/cgroup.c
  22 +++ b/kernel/cgroup/cgroup.c
  23 @@ -5827,6 +5827,8 @@ void cgroup_sk_clone(struct sock_cgroup_data *skcd)
  24  {
  25         /* Socket clone path */
  26         if (skcd->val) {
  27 +               if (skcd->no_refcnt)
  28 +                       return;
  29                 /*
  30                  * We might be cloning a socket which is left in an empty
  31                  * cgroup and the cgroup might have already been rmdir'd.
  32 --
  33 2.25.1
  34