pkt_sched: Fix qdisc_create on stab error handling

If qdisc_get_stab returns error in qdisc_create there is skipped qdisc
ops->destroy, which is necessary because it's after ops->init at the
moment, so memory leaks are quite probable.

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 1367aa2..903e418 100644 (file)
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -809,7 +809,7 @@ qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
                        stab = qdisc_get_stab(tca[TCA_STAB]);
                        if (IS_ERR(stab)) {
                                err = PTR_ERR(stab);
-                               goto err_out3;
+                               goto err_out4;
                        }
                        sch->stab = stab;
                }
@@ -838,7 +838,6 @@ qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
                return sch;
        }
 err_out3:
-       qdisc_put_stab(sch->stab);
        dev_put(dev);
        kfree((char *) sch - sch->padded);
 err_out2:
@@ -852,6 +851,7 @@ err_out4:
         * Any broken qdiscs that would require a ops->reset() here?
         * The qdisc was never in action so it shouldn't be necessary.
         */
+       qdisc_put_stab(sch->stab);
        if (ops->destroy)
                ops->destroy(sch);
        goto err_out3;