[PATCH 0/2] cgroup: pids: fix invalid reference semantics

[Aleksa Sarai <cyphar@cyphar.com>]

I've discovered a bug in the PIDs cgroup. We aren't properly dealing
with css references (we grab a reference to a css in ->can_attach() and
then drop a reference to a *different* css in ->{cancel_,}attach(). This
is a quick patch I wrote which I believe fixes the problem by getting
cgroup_migrate() to grab a reference before ->can_attach() and once the
attach has failed or succeded.

Aleksa Sarai (2):
  cgroup: get a ref to source csses when migrating
  cgroup: pids: fix invalid get/put usage

 kernel/cgroup.c      | 21 +++++++++++++++++++--
 kernel/cgroup_pids.c | 13 +------------
 2 files changed, 20 insertions(+), 14 deletions(-)

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2.5.0