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cls_tcindex: use tcf_exts_get_net() before call_rcu()

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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 13:47:29 -08:00 committed by David S. Miller
parent 96585063a2
commit f2b751053e
1 changed files with 26 additions and 7 deletions
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33
net/sched/cls_tcindex.c
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@ -139,13 +139,19 @@ static int tcindex_init(struct tcf_proto *tp)
return 0;
}
static void __tcindex_destroy_rexts(struct tcindex_filter_result *r)
{
tcf_exts_destroy(&r->exts);
tcf_exts_put_net(&r->exts);
}
static void tcindex_destroy_rexts_work(struct work_struct *work)
{
struct tcindex_filter_result *r;
r = container_of(work, struct tcindex_filter_result, work);
rtnl_lock();
tcf_exts_destroy(&r->exts);
__tcindex_destroy_rexts(r);
rtnl_unlock();
}
@ -158,14 +164,20 @@ static void tcindex_destroy_rexts(struct rcu_head *head)
tcf_queue_work(&r->work);
}
static void __tcindex_destroy_fexts(struct tcindex_filter *f)
{
tcf_exts_destroy(&f->result.exts);
tcf_exts_put_net(&f->result.exts);
kfree(f);
}
static void tcindex_destroy_fexts_work(struct work_struct *work)
{
struct tcindex_filter *f = container_of(work, struct tcindex_filter,
work);
rtnl_lock();
tcf_exts_destroy(&f->result.exts);
kfree(f);
__tcindex_destroy_fexts(f);
rtnl_unlock();
}
@ -210,10 +222,17 @@ found:
* grace period, since converted-to-rcu actions are relying on that
* in cleanup() callback
*/
if (f)
call_rcu(&f->rcu, tcindex_destroy_fexts);
else
call_rcu(&r->rcu, tcindex_destroy_rexts);
if (f) {
if (tcf_exts_get_net(&f->result.exts))
call_rcu(&f->rcu, tcindex_destroy_fexts);
else
__tcindex_destroy_fexts(f);
} else {
if (tcf_exts_get_net(&r->exts))
call_rcu(&r->rcu, tcindex_destroy_rexts);
else
__tcindex_destroy_rexts(r);
}
*last = false;
return 0;