[PATCH net] sch_htb: fix null pointer dereference on a null new_q

From: Yunjian Wang <redacted>

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: d03b195b5aa0 ("sch_htb: Hierarchical QoS hardware offload")

Signed-off-by: Yunjian Wang <redacted>
---
 net/sched/sch_htb.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 62e12cb41a3e..081c11d5717c 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c

@@ -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);
+			}
 		}
 	}
 

-- 
2.23.0