From 4e6263ec8bc965f0bd1c24bb40694a38e382e7a9 Mon Sep 17 00:00:00 2001 From: Zhengchao Shao Date: Tue, 27 Sep 2022 20:48:53 +0800 Subject: net: sched: ensure n arg not empty before call bind_class All bind_class callbacks are directly returned when n arg is empty. Therefore, bind_class is invoked only when n arg is not empty. Signed-off-by: Zhengchao Shao Signed-off-by: David S. Miller --- net/sched/sch_api.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/sched') diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 7c15f1f3da17..c98af0ada706 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -1915,7 +1915,7 @@ static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg) { struct tcf_bind_args *a = (void *)arg; - if (tp->ops->bind_class) { + if (n && tp->ops->bind_class) { struct Qdisc *q = tcf_block_q(tp->chain->block); sch_tree_lock(q); -- cgit