diff options
| author | Cong Wang <xiyou.wangcong@gmail.com> | 2019-09-12 10:22:30 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-21 07:15:28 +0200 |
| commit | e0f600b69df33b5ef69c2821ac69fafa96baab98 (patch) | |
| tree | c34e8556ec0cb9737c8167f185a52b7ccc20f1c0 /net/sched | |
| parent | 717ad917f254f0bfce622271a3f8a01dd66de48f (diff) | |
net_sched: let qdisc_put() accept NULL pointer
[ Upstream commit 6efb971ba8edfbd80b666f29de12882852f095ae ]
When tcf_block_get() fails in sfb_init(), q->qdisc is still a NULL
pointer which leads to a crash in sfb_destroy(). Similar for
sch_dsmark.
Instead of fixing each separately, Linus suggested to just accept
NULL pointer in qdisc_put(), which would make callers easier.
(For sch_dsmark, the bug probably exists long before commit
6529eaba33f0.)
Fixes: 6529eaba33f0 ("net: sched: introduce tcf block infractructure")
Reported-by: syzbot+d5870a903591faaca4ae@syzkaller.appspotmail.com
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/sch_generic.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 79549baf5804..21b981abbacb 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -703,7 +703,11 @@ static void qdisc_rcu_free(struct rcu_head *head) void qdisc_destroy(struct Qdisc *qdisc) { - const struct Qdisc_ops *ops = qdisc->ops; + const struct Qdisc_ops *ops; + + if (!qdisc) + return; + ops = qdisc->ops; if (qdisc->flags & TCQ_F_BUILTIN || !refcount_dec_and_test(&qdisc->refcnt)) |