commit ed1481681414e4d4264ad46864d5c1da5ff6ccb1
author Cong Wang <xiyou.wangcong@gmail.com> Mon Nov 06 13:47:22 2017 -0800
committer David S. Miller <davem@davemloft.net> Thu Nov 09 10:03:09 2017 +0900
tree 7674aba4bcb962e836a97dc7a6cced3bf06e37e8
parent aae2c35ec89252639a97769fa72dbbf8f1cc3107

cls_cgroup: use tcf_exts_get_net() before call_rcu()

Hold netns refcnt before call_rcu() and release it after
the tcf_exts_destroy() is done.

Note, on ->destroy() path we have to respect the return value
of tcf_exts_get_net(), on other paths it should always return
true, so we don't need to care.

Cc: Lucas Bates <lucasb@mojatatu.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>