From: Cong Wang xiyou.wangcong@gmail.com
commit 8b142a00edcf8422ca48b8de88d286efb500cb53 upstream
At least sch_red and sch_tbf don't implement ->tcf_block() while still have a non-zero tc "class".
Instead of adding nop implementations to each of such qdisc's, we can just relax the check of cops->tcf_block() in tc_bind_tclass(). They don't support TC filter anyway.
Reported-by: syzbot+21b29db13c065852f64b@syzkaller.appspotmail.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 Signed-off-by: Zubin Mithra zsm@chromium.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/sched/sch_api.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 637949b576c63..296e95f72eb15 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -1695,6 +1695,8 @@ static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid, cl = cops->find(q, portid); if (!cl) return; + if (!cops->tcf_block) + return; block = cops->tcf_block(q, cl); if (!block) return;