net: sched: fix unbalance in the error path of tca_action_flush()

dcaratti · davem330 · commit 66dede2d6b23 · 2018-02-16T15:43:17.000-05:00
When tca_action_flush() calls the action walk() and gets an error,
a successful call to nla_nest_start() is not followed by a call to
nla_nest_cancel(). It's harmless, as the skb is freed in the error
path - but it's worth to fix this unbalance.

Signed-off-by: Davide Caratti &lt;dcaratti@redhat.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
@@ -938,8 +938,10 @@ static int tca_action_flush(struct net *net, struct nlattr *nla,
 		goto out_module_put;
 
 	err = ops->walk(net, skb, &dcb, RTM_DELACTION, ops);
-	if (err <= 0)
+	if (err <= 0) {
+		nla_nest_cancel(skb, nest);
 		goto out_module_put;
+	}
 
 	nla_nest_end(skb, nest);
 
