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net: sched: ensure n arg not empty before call bind_class

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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 <shaozhengchao@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zhengchao Shao 2022-09-27 20:48:53 +08:00 committed by David S. Miller
parent bc37b24ee0
commit 4e6263ec8b
1 changed files with 1 additions and 1 deletions
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2
net/sched/sch_api.c
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@ -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);