diff options
| author | Davide Caratti <dcaratti@redhat.com> | 2020-12-17 22:29:46 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2020-12-18 16:43:29 -0800 |
| commit | 698285da79f5b0b099db15a37ac661ac408c80eb (patch) | |
| tree | e09d0bd19ee78c881cfffa08118898d2692fab3d | |
| parent | b27f0c7825e3774e9ba036b25ed4dd62aec4c4c9 (diff) | |
net/sched: sch_taprio: ensure to reset/destroy all child qdiscs
taprio_graft() can insert a NULL element in the array of child qdiscs. As
a consquence, taprio_reset() might not reset child qdiscs completely, and
taprio_destroy() might leak resources. Fix it by ensuring that loops that
iterate over q->qdiscs[] don't end when they find the first NULL item.
Fixes: 44d4775ca518 ("net/sched: sch_taprio: reset child qdiscs before freeing them")
Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler")
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Link: https://lore.kernel.org/r/13edef6778fef03adc751582562fba4a13e06d6a.1608240532.git.dcaratti@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | net/sched/sch_taprio.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c index c74817ec9964..6f775275826a 100644 --- a/net/sched/sch_taprio.c +++ b/net/sched/sch_taprio.c @@ -1605,8 +1605,9 @@ static void taprio_reset(struct Qdisc *sch) hrtimer_cancel(&q->advance_timer); if (q->qdiscs) { - for (i = 0; i < dev->num_tx_queues && q->qdiscs[i]; i++) - qdisc_reset(q->qdiscs[i]); + for (i = 0; i < dev->num_tx_queues; i++) + if (q->qdiscs[i]) + qdisc_reset(q->qdiscs[i]); } sch->qstats.backlog = 0; sch->q.qlen = 0; @@ -1626,7 +1627,7 @@ static void taprio_destroy(struct Qdisc *sch) taprio_disable_offload(dev, q, NULL); if (q->qdiscs) { - for (i = 0; i < dev->num_tx_queues && q->qdiscs[i]; i++) + for (i = 0; i < dev->num_tx_queues; i++) qdisc_put(q->qdiscs[i]); kfree(q->qdiscs); |