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linux/net/sched
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Wang Hai f612466ebe net/sched: fix netdevice reference leaks in attach_default_qdiscs() 
In attach_default_qdiscs(), if a dev has multiple queues and queue 0 fails
to attach qdisc because there is no memory in attach_one_default_qdisc().
Then dev->qdisc will be noop_qdisc by default. But the other queues may be
able to successfully attach to default qdisc.

In this case, the fallback to noqueue process will be triggered. If the
original attached qdisc is not released and a new one is directly
attached, this will cause netdevice reference leaks.

The following is the bug log:

veth0: default qdisc (fq_codel) fail, fallback to noqueue
unregister_netdevice: waiting for veth0 to become free. Usage count = 32
leaked reference.
 qdisc_alloc+0x12e/0x210
 qdisc_create_dflt+0x62/0x140
 attach_one_default_qdisc.constprop.41+0x44/0x70
 dev_activate+0x128/0x290
 __dev_open+0x12a/0x190
 __dev_change_flags+0x1a2/0x1f0
 dev_change_flags+0x23/0x60
 do_setlink+0x332/0x1150
 __rtnl_newlink+0x52f/0x8e0
 rtnl_newlink+0x43/0x70
 rtnetlink_rcv_msg+0x140/0x3b0
 netlink_rcv_skb+0x50/0x100
 netlink_unicast+0x1bb/0x290
 netlink_sendmsg+0x37c/0x4e0
 sock_sendmsg+0x5f/0x70
 ____sys_sendmsg+0x208/0x280

Fix this bug by clearing any non-noop qdiscs that may have been assigned
before trying to re-attach.

Fixes: bf6dba76d2 ("net: sched: fallback to qdisc noqueue if default qdisc setup fail")
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Link: https://lore.kernel.org/r/20220826090055.24424-1-wanghai38@huawei.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2022-08-30 15:10:08 +02:00
..
act_api.c net/sched: act_api: Notify user space if any actions were flushed before error 2022-06-27 21:51:23 -07:00
act_bpf.c bpf: Keep the (rcv) timestamp behavior for the existing tc-bpf@ingress 2022-03-03 14:38:48 +00:00
act_connmark.c flow_offload: fill flags to action structure 2021-12-19 14:08:47 +00:00
act_csum.c net/sched: act_api: Add extack to offload_act_setup() callback 2022-04-08 13:45:43 +01:00
act_ct.c net/sched: act_ct: set 'net' pointer when creating new nf_flow_table 2022-07-11 16:25:14 +02:00
act_ctinfo.c flow_offload: fill flags to action structure 2021-12-19 14:08:47 +00:00
act_gact.c net/sched: act_gact: Add extack messages for offload failure 2022-04-08 13:45:43 +01:00
act_gate.c net/sched: act_api: Add extack to offload_act_setup() callback 2022-04-08 13:45:43 +01:00
act_ife.c flow_offload: fill flags to action structure 2021-12-19 14:08:47 +00:00
act_ipt.c flow_offload: fill flags to action structure 2021-12-19 14:08:47 +00:00
act_meta_mark.c
act_meta_skbprio.c
act_meta_skbtcindex.c
act_mirred.c net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
act_mpls.c net/sched: act_mpls: Add extack messages for offload failure 2022-04-08 13:45:43 +01:00
act_nat.c flow_offload: fill flags to action structure 2021-12-19 14:08:47 +00:00
act_pedit.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-05-19 11:23:59 -07:00
act_police.c net/sched: act_police: allow 'continue' action offload 2022-07-06 12:44:39 +01:00
act_sample.c net/sched: act_api: Add extack to offload_act_setup() callback 2022-04-08 13:45:43 +01:00
act_simple.c flow_offload: fill flags to action structure 2021-12-19 14:08:47 +00:00
act_skbedit.c net: sched: support hash selecting tx queue 2022-04-19 12:20:45 +02:00
act_skbmod.c flow_offload: fill flags to action structure 2021-12-19 14:08:47 +00:00
act_tunnel_key.c net/sched: act_tunnel_key: Add extack message for offload failure 2022-04-08 13:45:43 +01:00
act_vlan.c net/sched: act_vlan: Add extack message for offload failure 2022-04-08 13:45:43 +01:00
cls_api.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-07-21 13:03:39 -07:00
cls_basic.c net_sched: refactor TC action init API 2021-08-02 10:24:38 +01:00
cls_bpf.c bpf: Keep the (rcv) timestamp behavior for the existing tc-bpf@ingress 2022-03-03 14:38:48 +00:00
cls_cgroup.c net_sched: refactor TC action init API 2021-08-02 10:24:38 +01:00
cls_flow.c net_sched: refactor TC action init API 2021-08-02 10:24:38 +01:00
cls_flower.c net/sched: flower: Add PPPoE filter 2022-07-26 10:20:29 -07:00
cls_fw.c net_sched: refactor TC action init API 2021-08-02 10:24:38 +01:00
cls_matchall.c net/sched: matchall: Avoid overwriting error messages 2022-04-08 13:45:43 +01:00
cls_route.c net_sched: cls_route: disallow handle of 0 2022-08-15 11:46:30 +01:00
cls_rsvp6.c
cls_rsvp.c
cls_rsvp.h net_sched: refactor TC action init API 2021-08-02 10:24:38 +01:00
cls_tcindex.c net_sched: refactor TC action init API 2021-08-02 10:24:38 +01:00
cls_u32.c net/sched: cls_u32: fix possible leak in u32_init_knode() 2022-04-15 14:26:11 -07:00
em_canid.c
em_cmp.c
em_ipset.c
em_ipt.c
em_meta.c net_sched: em_meta: add READ_ONCE() in var_sk_bound_if() 2022-05-16 10:31:06 +01:00
em_nbyte.c
em_text.c
em_u32.c
ematch.c
Kconfig
Makefile
sch_api.c net: rename reference+tracking helpers 2022-06-09 21:52:55 -07:00
sch_atm.c net: sched: Remove Qdisc::running sequence counter 2021-10-18 12:54:41 +01:00
sch_blackhole.c
sch_cake.c sch_cake: revise Diffserv docs 2022-01-07 08:41:29 -08:00
sch_cbq.c net/sched: sch_cbq: change the type of cbq_set_lss to void 2022-07-27 18:30:18 -07:00
sch_cbs.c
sch_choke.c
sch_codel.c
sch_drr.c net: sched: Remove Qdisc::running sequence counter 2021-10-18 12:54:41 +01:00
sch_dsmark.c net/sched: store the last executed chain also for clsact egress 2021-07-29 22:17:37 +01:00
sch_etf.c
sch_ets.c net/sched: sch_ets: don't remove idle classes from the round-robin list 2021-12-13 12:30:23 +00:00
sch_fifo.c net_sched: fix NULL deref in fifo_set_limit() 2021-10-01 14:59:10 -07:00
sch_fq_codel.c fq_codel: generalise ce_threshold marking for subset of traffic 2021-10-20 15:24:36 -07:00
sch_fq_pie.c net/sched: fq_pie: prevent dismantle issue 2021-12-09 08:01:00 -08:00
sch_fq.c
sch_frag.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2021-12-31 14:35:40 +00:00
sch_generic.c net/sched: fix netdevice reference leaks in attach_default_qdiscs() 2022-08-30 15:10:08 +02:00
sch_gred.c net: sched: gred: dynamically allocate tc_gred_qopt_offload 2021-10-27 12:06:52 -07:00
sch_hfsc.c net: sched: Remove Qdisc::running sequence counter 2021-10-18 12:54:41 +01:00
sch_hhf.c
sch_htb.c sch_htb: Fail on unsupported parameters when offload is requested 2022-01-25 20:00:02 -08:00
sch_ingress.c
sch_mq.c net: sched: Remove Qdisc::running sequence counter 2021-10-18 12:54:41 +01:00
sch_mqprio.c net: sched: Remove Qdisc::running sequence counter 2021-10-18 12:54:41 +01:00
sch_multiq.c net: sched: Remove Qdisc::running sequence counter 2021-10-18 12:54:41 +01:00
sch_netem.c net/sched: sch_netem: Fix arithmetic in netem_dump() for 32-bit platforms 2022-06-17 20:29:38 -07:00
sch_pie.c
sch_plug.c
sch_prio.c net: sched: Remove Qdisc::running sequence counter 2021-10-18 12:54:41 +01:00
sch_qfq.c sch_qfq: prevent shift-out-of-bounds in qfq_init_qdisc 2022-01-04 12:36:51 +00:00
sch_red.c
sch_sfb.c net/sched: store the last executed chain also for clsact egress 2021-07-29 22:17:37 +01:00
sch_sfq.c net/sched: store the last executed chain also for clsact egress 2021-07-29 22:17:37 +01:00
sch_skbprio.c
sch_taprio.c time64.h: consolidate uses of PSEC_PER_NSEC 2022-06-30 21:18:16 -07:00
sch_tbf.c net: sched: tbf: don't call qdisc_put() while holding tree lock 2022-08-30 11:41:24 +02:00
sch_teql.c