[PATCH 5.2 112/135] net: sched: sch_taprio: fix memleak in error path for sched list parse

[Sasha Levin]

From: Ivan Khoronzhuk <ivan.khoronzhuk@xxxxxxxxxx>

[ Upstream commit 51650d33b2771acd505068da669cf85cffac369a ]

In error case, all entries should be freed from the sched list
before deleting it. For simplicity use rcu way.

Fixes: 5a781ccbd19e46 ("tc: Add support for configuring the taprio scheduler")
Acked-by: Vinicius Costa Gomes <vinicius.gomes@xxxxxxxxx>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/sched/sch_taprio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index 9ecfb8f5902a4..8be89aa52b6e8 100644
--- a/net/sched/sch_taprio.c
+++ b/net/sched/sch_taprio.c
@@ -849,7 +849,8 @@ static int taprio_change(struct Qdisc *sch, struct nlattr *opt,
 	spin_unlock_bh(qdisc_lock(sch));
 
 free_sched:
-	kfree(new_admin);
+	if (new_admin)
+		call_rcu(&new_admin->rcu, taprio_free_sched_cb);
 
 	return err;
 }
-- 
2.20.1