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cls_rsvp: 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>
This commit is contained in:
Cong Wang 2017-11-06 13:47:28 -08:00 committed by David S. Miller
parent 3fd51de5e3
commit 96585063a2
1 changed files with 12 additions and 3 deletions
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15
net/sched/cls_rsvp.h
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@ -285,13 +285,19 @@ static int rsvp_init(struct tcf_proto *tp)
return -ENOBUFS;
}
static void __rsvp_delete_filter(struct rsvp_filter *f)
{
tcf_exts_destroy(&f->exts);
tcf_exts_put_net(&f->exts);
kfree(f);
}
static void rsvp_delete_filter_work(struct work_struct *work)
{
struct rsvp_filter *f = container_of(work, struct rsvp_filter, work);
rtnl_lock();
tcf_exts_destroy(&f->exts);
kfree(f);
__rsvp_delete_filter(f);
rtnl_unlock();
}
@ -310,7 +316,10 @@ static void rsvp_delete_filter(struct tcf_proto *tp, struct rsvp_filter *f)
* grace period, since converted-to-rcu actions are relying on that
* in cleanup() callback
*/
call_rcu(&f->rcu, rsvp_delete_filter_rcu);
if (tcf_exts_get_net(&f->exts))
call_rcu(&f->rcu, rsvp_delete_filter_rcu);
else
__rsvp_delete_filter(f);
}
static void rsvp_destroy(struct tcf_proto *tp)