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>

diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index 26fb8a6..c74817e 100644 (file)
--- 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,