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Eric Dumazet ec51500553 fq_codel: reject silly quantum parameters 
[ Upstream commit c7c5e6ff53 ]

syzbot found that forcing a big quantum attribute would crash hosts fast,
essentially using this:

tc qd replace dev eth0 root fq_codel quantum 4294967295

This is because fq_codel_dequeue() would have to loop
~2^31 times in :

	if (flow->deficit <= 0) {
		flow->deficit += q->quantum;
		list_move_tail(&flow->flowchain, &q->old_flows);
		goto begin;
	}

SFQ max quantum is 2^19 (half a megabyte)
Lets adopt a max quantum of one megabyte for FQ_CODEL.

Fixes: 4b549a2ef4 ("fq_codel: Fair Queue Codel AQM")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-09-22 12:39:31 +02:00
..
act_api.c
net: sched: fix error return code in tcf_del_walker()
2021-06-17 11:36:18 -07:00
act_bpf.c
bpf, sched: Remove unneeded rcu_read_lock() around BPF program invocation
2021-06-24 19:43:11 +02:00
act_connmark.c
net_sched: defer tcf_idr_insert() in tcf_action_init_1()
2020-09-24 19:46:21 -07:00
act_csum.c
net_sched: defer tcf_idr_insert() in tcf_action_init_1()
2020-09-24 19:46:21 -07:00
act_ct.c
net/sched: act_ct: remove and free nf_table callbacks
2021-07-02 13:36:35 -07:00
act_ctinfo.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2020-10-05 18:40:01 -07:00
act_gact.c
net_sched: defer tcf_idr_insert() in tcf_action_init_1()
2020-09-24 19:46:21 -07:00
act_gate.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2020-10-05 18:40:01 -07:00
act_ife.c
net_sched: defer tcf_idr_insert() in tcf_action_init_1()
2020-09-24 19:46:21 -07:00
act_ipt.c
treewide: rename nla_strlcpy to nla_strscpy.
2020-11-16 08:08:54 -08:00
act_meta_mark.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
act_meta_skbprio.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
act_meta_skbtcindex.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
act_mirred.c
net: sched: act_mirred: Reset ct info when mirror/redirect skb
2021-08-09 10:58:47 +01:00
act_mpls.c
net/sched: act_mpls: ensure LSE is pullable before reading it
2020-12-03 11:13:37 -08:00
act_nat.c
net_sched: defer tcf_idr_insert() in tcf_action_init_1()
2020-09-24 19:46:21 -07:00
act_pedit.c
net_sched: defer tcf_idr_insert() in tcf_action_init_1()
2020-09-24 19:46:21 -07:00
act_police.c
net/sched: act_police: add support for packet-per-second policing
2021-03-13 14:18:09 -08:00
act_sample.c
psample: Encapsulate packet metadata in a struct
2021-03-14 15:00:43 -07:00
act_simple.c
treewide: rename nla_strlcpy to nla_strscpy.
2020-11-16 08:08:54 -08:00
act_skbedit.c
net_sched: defer tcf_idr_insert() in tcf_action_init_1()
2020-09-24 19:46:21 -07:00
act_skbmod.c
net/sched: act_skbmod: Skip non-Ethernet packets
2021-07-20 07:13:51 -07:00
act_tunnel_key.c
net/sched: act_tunnel_key: fix OOB write in case of IPv6 ERSPAN tunnels
2020-10-20 21:10:41 -07:00
act_vlan.c
net/sched: act_vlan: No dump for unset priority
2021-06-01 16:54:42 -07:00
cls_api.c
net: Fix offloading indirect devices dependency on qdisc order creation
2021-09-18 13:43:53 +02:00
cls_basic.c
net_sched: fix ops->bind_class() implementations
2020-01-27 10:51:43 +01:00
cls_bpf.c
bpf, sched: Remove unneeded rcu_read_lock() around BPF program invocation
2021-06-24 19:43:11 +02:00
cls_cgroup.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
cls_flow.c
Merge tag 'uninit-macro-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2020-08-04 13:49:43 -07:00
cls_flower.c
Revert "net/sched: cls_flower: Remove match on n_proto"
2021-06-21 14:46:36 -07:00
cls_fw.c
net_sched: fix ops->bind_class() implementations
2020-01-27 10:51:43 +01:00
cls_matchall.c
net: qos offload add flow status with dropped count
2020-06-19 12:53:30 -07:00
cls_route.c
net_sched: cls_route: remove the right filter from hashtable
2020-03-16 01:59:32 -07:00
cls_rsvp6.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
cls_rsvp.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
cls_rsvp.h
net: sched: Fix spelling mistakes
2021-05-31 22:44:56 -07:00
cls_tcindex.c
net: sched: fix memory leak in tcindex_partial_destroy_work
2021-07-18 09:45:46 -07:00
cls_u32.c
net/sched: cls_u32: simplify the return expression of u32_reoffload_knode()
2020-12-08 16:22:53 -08:00
em_canid.c
net: sched: kerneldoc fixes
2020-07-13 17:20:40 -07:00
em_cmp.c
net: sched: fix misspellings using misspell-fixer tool
2020-11-10 17:00:28 -08:00
em_ipset.c
sched: consistently handle layer3 header accesses in the presence of VLANs
2020-07-03 14:34:53 -07:00
em_ipt.c
sched: consistently handle layer3 header accesses in the presence of VLANs
2020-07-03 14:34:53 -07:00
em_meta.c
sched: consistently handle layer3 header accesses in the presence of VLANs
2020-07-03 14:34:53 -07:00
em_nbyte.c
net: sched: Return the correct errno code
2021-02-06 11:15:28 -08:00
em_text.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
em_u32.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
ematch.c
net: sched: Fix spelling mistakes
2021-05-31 22:44:56 -07:00
Kconfig
net: sched: incorrect Kconfig dependencies on Netfilter modules
2020-12-09 15:49:29 -08:00
Makefile
net/sched: sch_frag: add generic packet fragment support.
2020-11-27 14:36:02 -08:00
sch_api.c
net: sched: avoid duplicates in classes dump
2021-03-04 14:27:47 -08:00
sch_atm.c
net: sched: Add extack to Qdisc_class_ops.delete
2021-01-22 20:41:29 -08:00
sch_blackhole.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_cake.c
sch_cake: fix srchost/dsthost hashing mode
2021-08-18 10:14:00 +01:00
sch_cbq.c
net: sched: Fix qdisc_rate_table refcount leak when get tcf_block failed
2021-09-15 10:02:31 +02:00
sch_cbs.c
net: don't include ethtool.h from netdevice.h
2020-11-23 17:27:04 -08:00
sch_choke.c
net: sched: validate stab values
2021-03-10 15:47:52 -08:00
sch_codel.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_drr.c
net: sched: Add extack to Qdisc_class_ops.delete
2021-01-22 20:41:29 -08:00
sch_dsmark.c
sch_dsmark: fix a NULL deref in qdisc_reset()
2021-05-24 13:11:44 -07:00
sch_etf.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_ets.c
net/sched: ets: fix crash when flipping from 'strict' to 'quantum'
2021-08-25 11:15:30 +01:00
sch_fifo.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_fq_codel.c
fq_codel: reject silly quantum parameters
2021-09-22 12:39:31 +02:00
sch_fq_pie.c
net/sched: fq_pie: fix OOB access in the traffic path
2021-05-23 17:16:09 -07:00
sch_fq.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_frag.c
net/sched: sch_frag: fix stack OOB read while fragmenting IPv4 packets
2021-04-29 15:31:53 -07:00
sch_generic.c
net: sched: fix lockdep_set_class() typo error for sch->seqlock
2021-08-04 09:59:24 +01:00
sch_gred.c
net: sched: Fix spelling mistakes
2021-05-31 22:44:56 -07:00
sch_hfsc.c
net: sched: Add extack to Qdisc_class_ops.delete
2021-01-22 20:41:29 -08:00
sch_hhf.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_htb.c
sch_htb: Fix inconsistency when leaf qdisc creation fails
2021-09-15 10:02:31 +02:00
sch_ingress.c
net: sched: Pass ingress block to tcf_classify_ingress
2020-02-19 17:49:48 -08:00
sch_mq.c
net: sched: fix dump qlen for sch_mq/sch_mqprio with NOLOCK subqueues
2019-12-03 11:53:55 -08:00
sch_mqprio.c
mqprio: Fix out-of-bounds access in mqprio_dump
2019-12-06 11:58:45 -08:00
sch_multiq.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_netem.c
netem: fix zero division in tabledist
2020-10-29 11:45:47 -07:00
sch_pie.c
net: sched: fix misspellings using misspell-fixer tool
2020-11-10 17:00:28 -08:00
sch_plug.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_prio.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_qfq.c
pkt_sched: sch_qfq: fix qfq_change_class() error path
2021-06-21 14:50:19 -07:00
sch_red.c
net: sched: validate stab values
2021-03-10 15:47:52 -08:00
sch_sfb.c
net: sched: Add extack to Qdisc_class_ops.delete
2021-01-22 20:41:29 -08:00
sch_sfq.c
net: sched: validate stab values
2021-03-10 15:47:52 -08:00
sch_skbprio.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_taprio.c
fix array-index-out-of-bounds in taprio_change
2021-09-18 13:44:00 +02:00
sch_tbf.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_teql.c
net: sched: sch_teql: fix null-pointer dereference
2021-04-08 14:14:42 -07:00