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net_sched: acquire RTNL in tc_action_net_exit()

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I forgot to acquire RTNL in tc_action_net_exit()
which leads that action ops->cleanup() is not always
called with RTNL. This usually is not a big deal because
this function is called after all netns refcnt are gone,
but given RTNL protects more than just actions, add it
for safety and consistency.

Also add an assertion to catch other potential bugs.

Fixes: ddf97ccdd7 ("net_sched: add network namespace support for tc actions")
Reported-by: Lucas Bates <lucasb@mojatatu.com>
Tested-by: 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>
This commit is contained in:
Cong Wang 2017-11-01 10:23:49 -07:00 committed by David S. Miller
parent 74784da82f
commit a159d3c4b8
2 changed files with 4 additions and 0 deletions
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2
include/net/act_api.h
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@ -122,7 +122,9 @@ void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
static inline void tc_action_net_exit(struct tc_action_net *tn)
{
rtnl_lock();
tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
rtnl_unlock();
kfree(tn->idrinfo);
}

2
net/sched/act_api.c
View File

@ -86,6 +86,8 @@ int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
{
int ret = 0;
ASSERT_RTNL();
if (p) {
if (bind)
p->tcfa_bindcnt--;