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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: 44d4775ca5 ("net/sched: sch_taprio: reset child qdiscs before freeing them")
Fixes: 5a781ccbd1 ("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>
zero-sugar-mainline-defconfig
Davide Caratti 2020-12-17 22:29:46 +01:00 committed by Jakub Kicinski
parent b27f0c7825
commit 698285da79
1 changed files with 4 additions and 3 deletions
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7
net/sched/sch_taprio.c
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@ -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);