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| author | Cong Wang <xiyou.wangcong@gmail.com> | 2020-10-02 12:13:34 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-10-04 14:53:06 -0700 |
| commit | 580e4273d7a883ececfefa692c1f96bdbacb99b5 (patch) | |
| tree | 094b0f1cde71ff222877ed9f94175f474c387696 | |
| parent | 9a9e77495958c7382b2438bc19746dd3aaaabb8e (diff) | |
| download | linux-580e4273d7a883ececfefa692c1f96bdbacb99b5.tar.gz | |
net_sched: check error pointer in tcf_dump_walker()
Although we take RTNL on dump path, it is possible to
skip RTNL on insertion path. So the following race condition
is possible:
rtnl_lock() // no rtnl lock
mutex_lock(&idrinfo->lock);
// insert ERR_PTR(-EBUSY)
mutex_unlock(&idrinfo->lock);
tc_dump_action()
rtnl_unlock()
So we have to skip those temporary -EBUSY entries on dump path
too.
Reported-and-tested-by: syzbot+b47bc4f247856fb4d9e1@syzkaller.appspotmail.com
Fixes: 0fedc63fadf0 ("net_sched: commit action insertions together")
Cc: Vlad Buslov <vladbu@mellanox.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>
| -rw-r--r-- | net/sched/act_api.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/sched/act_api.c b/net/sched/act_api.c index 5612b336e18e2..798430e1a79f1 100644 --- a/net/sched/act_api.c +++ b/net/sched/act_api.c @@ -235,6 +235,8 @@ static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, index++; if (index < s_i) continue; + if (IS_ERR(p)) + continue; if (jiffy_since && time_after(jiffy_since, |