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| author |  Davide Caratti <dcaratti@redhat.com>
| 2020-12-16 19:33:29 +0100 |
|---|---|---|
| committer |  Jakub Kicinski <kuba@kernel.org>
| 2020-12-17 10:57:57 -0800 |
| commit | 44d4775ca51805b376a8db5b34f650434a08e556 (patch) | |
| tree | 36c649188f6e2d3945fce7398242af258c47db0e /net | |
| parent | nfp: move indirect block cleanup to flower app stop callback (diff) | |
| download | linux-44d4775ca51805b376a8db5b34f650434a08e556.tar.gz linux-44d4775ca51805b376a8db5b34f650434a08e556.tar.bz2 linux-44d4775ca51805b376a8db5b34f650434a08e556.zip | |
net/sched: sch_taprio: reset child qdiscs before freeing them
syzkaller shows that packets can still be dequeued while taprio_destroy()
is running. Let sch_taprio use the reset() function to cancel the advance
timer and drop all skbs from the child qdiscs.
Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler")
Link: https://syzkaller.appspot.com/bug?id=f362872379bf8f0017fb667c1ab158f2d1e764ae
Reported-by: syzbot+8971da381fb5a31f542d@syzkaller.appspotmail.com
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Link: https://lore.kernel.org/r/63b6d79b0e830ebb0283e020db4df3cdfdfb2b94.1608142843.git.dcaratti@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sched/sch_taprio.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c index 26fb8a62996b..c74817ec9964 100644 --- a/net/sched/sch_taprio.c +++ b/net/sched/sch_taprio.c @@ -1597,6 +1597,21 @@ free_sched: return err; } +static void taprio_reset(struct Qdisc *sch) +{ + struct taprio_sched *q = qdisc_priv(sch); + struct net_device *dev = qdisc_dev(sch); + int i; + + 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]); + } + sch->qstats.backlog = 0; + sch->q.qlen = 0; +} + static void taprio_destroy(struct Qdisc *sch) { struct taprio_sched *q = qdisc_priv(sch); @@ -1607,7 +1622,6 @@ static void taprio_destroy(struct Qdisc *sch) list_del(&q->taprio_list); spin_unlock(&taprio_list_lock); - hrtimer_cancel(&q->advance_timer); taprio_disable_offload(dev, q, NULL); @@ -1954,6 +1968,7 @@ static struct Qdisc_ops taprio_qdisc_ops __read_mostly = { .init = taprio_init, .change = taprio_change, .destroy = taprio_destroy, + .reset = taprio_reset, .peek = taprio_peek, .dequeue = taprio_dequeue, .enqueue = taprio_enqueue, |