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sch_htb: fix null pointer dereference on a null new_q

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sch_htb: fix null pointer dereference on a null new_q

Currently if new_q is null, the null new_q pointer will be
dereference when 'q->offload' is true. Fix this by adding
a braces around htb_parent_to_leaf_offload() to avoid it.

Addresses-Coverity: ("Dereference after null check")
Fixes: d03b195b5a ("sch_htb: Hierarchical QoS hardware offload")

Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yunjian Wang 2021-03-30 22:27:48 +08:00 committed by David S. Miller
parent 8a03dd9257
commit ae81feb733
1 changed files with 3 additions and 2 deletions
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5
net/sched/sch_htb.c
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@ -1675,9 +1675,10 @@ static int htb_delete(struct Qdisc *sch, unsigned long arg,
cl->parent->common.classid,
NULL);
if (q->offload) {
if (new_q)
if (new_q) {
htb_set_lockdep_class_child(new_q);
htb_parent_to_leaf_offload(sch, dev_queue, new_q);
htb_parent_to_leaf_offload(sch, dev_queue, new_q);
}
}
}