[PATCH net 2/3] net/sched: sch_sfb: Replace direct dequeue call with peek and qdisc_dequeue_peeked

[Jamal Hadi Salim <jhs@mojatatu.com>]

From: Victor Nogueria <victor@mojatatu.com>

When sfb has children (eg qfq qdisc) whose peek() callback is
qdisc_peek_dequeued(), we could get a kernel panic. When the parent of such
qdiscs (eg illustrated in patch #3 as tbf) wants to retrieve an skb from
its child (sfb in this case), it will do the following:
 1a. do a peek() - and when sensing there's an skb the child can offer, then
     - the child in this case(sfb) calls its child's (qfq) peek.
        qfq does the right thing and will return the gso_skb queue packet.
        Note: if there wasnt a gso_skb entry then qfq will store it there.
 1b. invoke a dequeue() on the child (sfb). And herein lies the problem.
     - sfb will call the child's dequeue() which will essentially just
       try to grab something of qfq's queue.

[  127.594489][  T453] KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]
[  127.594741][  T453] CPU: 2 UID: 0 PID: 453 Comm: ping Not tainted 7.1.0-rc1-00035-gac961974495b-dirty #793 PREEMPT(full)
[  127.595059][  T453] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  127.595254][  T453] RIP: 0010:qfq_dequeue+0x35c/0x1650 [sch_qfq]
[  127.595461][  T453] Code: 00 fc ff df 80 3c 02 00 0f 85 17 0e 00 00 4c 8d 73 48 48 89 9d b8 02 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 76 0c 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b
[  127.596081][  T453] RSP: 0018:ffff88810e5af440 EFLAGS: 00010216
[  127.596337][  T453] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: dffffc0000000000
[  127.596623][  T453] RDX: 0000000000000009 RSI: 0000001880000000 RDI: ffff888104fd82b0
[  127.596917][  T453] RBP: ffff888104fd8000 R08: ffff888104fd8280 R09: 1ffff110211893a3
[  127.597165][  T453] R10: 1ffff110211893a6 R11: 1ffff110211893a7 R12: 0000001880000000
[  127.597404][  T453] R13: ffff888104fd82b8 R14: 0000000000000048 R15: 0000000040000000
[  127.597644][  T453] FS:  00007fc380cbfc40(0000) GS:ffff88816f2a8000(0000) knlGS:0000000000000000
[  127.597956][  T453] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  127.598160][  T453] CR2: 00005610aa9890a8 CR3: 000000010369e000 CR4: 0000000000750ef0
[  127.598390][  T453] PKRU: 55555554
[  127.598509][  T453] Call Trace:
[  127.598629][  T453]  <TASK>
[  127.598718][  T453]  ? mark_held_locks+0x40/0x70
[  127.598890][  T453]  ? srso_alias_return_thunk+0x5/0xfbef5
[  127.599053][  T453]  sfb_dequeue+0x88/0x4d0
[  127.599174][  T453]  ? ktime_get+0x137/0x230
[  127.599328][  T453]  ? srso_alias_return_thunk+0x5/0xfbef5
[  127.599480][  T453]  ? qdisc_peek_dequeued+0x7b/0x350 [sch_qfq]
[  127.599670][  T453]  ? srso_alias_return_thunk+0x5/0xfbef5
[  127.599831][  T453]  tbf_dequeue+0x6b1/0x1098 [sch_tbf]
[  127.599988][  T453]  __qdisc_run+0x169/0x1900

The right thing to do in #1b is to grab the skb off gso_skb queue.
This patchset fixes that issue by changing #1b to use qdisc_dequeue_peeked()
method instead.

Fixes: e13e02a3c68d ("net_sched: SFB flow scheduler")
Signed-off-by: Victor Nogueria <victor@mojatatu.com>
---
 net/sched/sch_sfb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sched/sch_sfb.c b/net/sched/sch_sfb.c
index bd5ef561030f..d3ee8e5479b3 100644
--- a/net/sched/sch_sfb.c
+++ b/net/sched/sch_sfb.c
@@ -441,7 +441,7 @@ static struct sk_buff *sfb_dequeue(struct Qdisc *sch)
 	struct Qdisc *child = q->qdisc;
 	struct sk_buff *skb;
 
-	skb = child->dequeue(q->qdisc);
+	skb = qdisc_dequeue_peeked(child);
 
 	if (skb) {
 		qdisc_bstats_update(sch, skb);
-- 
2.34.1