From: Jarek Poplawski <jarkao2@gmail.com>
Date: Wed, 16 Sep 2009 06:42:05 +0000 (-0700)
Subject: pkt_sched: Fix qdisc_create on stab error handling
X-Git-Tag: firefly_0821_release~11864^2~348
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7c64b9f3f584008000cf3b960f25cd6a68fce191;p=firefly-linux-kernel-4.4.55.git

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 1367aa21fad5..903e4188b6ca 100644
--- 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;