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net_sched: initialize timer earlier in red_init()

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When red_init() fails, red_destroy() is called to clean up.
If the timer is not initialized yet, del_timer_sync() will
complain. So we have to move timer_setup() before any failure.

Reported-and-tested-by: syzbot+6e95a4fabf88dc217145@syzkaller.appspotmail.com
Fixes: aee9caa03f ("net: sched: sch_red: Add qevents "early_drop" and "mark"")
Cc: Petr Machata <petrm@mellanox.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2020-07-25 13:17:07 -07:00 committed by David S. Miller
parent 1255457429
commit 608b4adab1
1 changed files with 4 additions and 4 deletions
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8
net/sched/sch_red.c
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@ -333,6 +333,10 @@ static int red_init(struct Qdisc *sch, struct nlattr *opt,
struct nlattr *tb[TCA_RED_MAX + 1];
int err;
q->qdisc = &noop_qdisc;
q->sch = sch;
timer_setup(&q->adapt_timer, red_adaptative_timer, 0);
if (!opt)
return -EINVAL;
@ -341,10 +345,6 @@ static int red_init(struct Qdisc *sch, struct nlattr *opt,
if (err < 0)
return err;
q->qdisc = &noop_qdisc;
q->sch = sch;
timer_setup(&q->adapt_timer, red_adaptative_timer, 0);
err = __red_change(sch, tb, extack);
if (err)
return err;