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linux/net/sched
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Cong Wang 78533c4a29 net_sched: Prevent creation of classes with TC_H_ROOT 
[ Upstream commit 0c3057a5a04d07120b3d0ec9c79568fceb9c921e ]

The function qdisc_tree_reduce_backlog() uses TC_H_ROOT as a termination
condition when traversing up the qdisc tree to update parent backlog
counters. However, if a class is created with classid TC_H_ROOT, the
traversal terminates prematurely at this class instead of reaching the
actual root qdisc, causing parent statistics to be incorrectly maintained.
In case of DRR, this could lead to a crash as reported by Mingi Cho.

Prevent the creation of any Qdisc class with classid TC_H_ROOT
(0xFFFFFFFF) across all qdisc types, as suggested by Jamal.

Reported-by: Mingi Cho <mincho@theori.io>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Fixes: 066a3b5b23 ("[NET_SCHED] sch_api: fix qdisc_tree_decrease_qlen() loop")
Link: https://patch.msgid.link/20250306232355.93864-2-xiyou.wangcong@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-03-22 12:50:39 -07:00
..
act_api.c
net: use unrcu_pointer() helper
2024-12-09 10:32:10 +01:00
act_bpf.c
net/sched: avoid indirect act functions on retpoline kernels
2022-12-09 09:18:07 +00:00
act_connmark.c
net/sched: act_connmark: handle errno on tcf_idr_check_alloc
2023-03-01 08:19:09 +00:00
act_csum.c
net: skbuff: hide csum_not_inet when CONFIG_IP_SCTP not set
2023-04-19 13:04:30 +01:00
act_ct.c
sched: act_ct: take care of padding in struct zones_ht_key
2024-08-11 12:47:18 +02:00
act_ctinfo.c
net/sched: act_ctinfo: use percpu stats
2023-02-13 20:09:01 -08:00
act_gact.c
Merge tag 'net-next-6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2022-12-13 15:47:48 -08:00
act_gate.c
net/sched: act_gate: use percpu stats
2023-02-16 10:39:28 +01:00
act_ife.c
net/sched: avoid indirect act functions on retpoline kernels
2022-12-09 09:18:07 +00:00
act_ipt.c
net/sched: act_ipt: zero skb->cb before calling target
2023-06-29 12:10:37 +02:00
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: don't override retval if we already lost the skb
2024-03-01 13:35:06 +01:00
act_mpls.c
net/sched: remove two skb_mac_header() uses
2023-03-22 22:43:23 -07:00
act_nat.c
net/sched: act_nat: transition to percpu stats and rcu
2023-02-16 10:39:28 +01:00
act_pedit.c
net/sched: act_pedit: Add size check for TCA_PEDIT_PARMS_EX
2023-07-04 10:31:38 +02:00
act_police.c
net: move gso declarations and functions to their own files
2023-06-10 00:11:41 -07:00
act_sample.c
net/sched: act_sample: fix action bind logic
2023-02-26 18:27:45 +00:00
act_simple.c
net/sched: avoid indirect act functions on retpoline kernels
2022-12-09 09:18:07 +00:00
act_skbedit.c
net/sched: avoid indirect act functions on retpoline kernels
2022-12-09 09:18:07 +00:00
act_skbmod.c
net/sched: act_skbmod: prevent kernel-infoleak
2024-04-10 16:35:51 +02:00
act_tunnel_key.c
net/sched: act_tunnel_key: add support for "don't fragment"
2023-03-30 23:24:24 -07:00
act_vlan.c
net/sched: avoid indirect act functions on retpoline kernels
2022-12-09 09:18:07 +00:00
cls_api.c
net/sched: cls_api: fix error handling causing NULL dereference
2025-02-27 04:10:48 -08:00
cls_basic.c
net/sched: avoid indirect classify functions on retpoline kernels
2022-12-09 09:18:07 +00:00
cls_bpf.c
net: sched: cls_bpf: Undo tcf_bind_filter in case of an error
2023-07-17 07:33:39 +01:00
cls_cgroup.c
net/sched: avoid indirect classify functions on retpoline kernels
2022-12-09 09:18:07 +00:00
cls_flow.c
net_sched: cls_flow: validate TCA_FLOW_RSHIFT attribute
2025-01-17 13:36:12 +01:00
cls_flower.c
net: sched: fix erspan_opt settings in cls_flower
2024-12-14 19:59:38 +01:00
cls_fw.c
net/sched: cls_fw: No longer copy tcf_result on update to avoid use-after-free
2023-07-31 20:10:36 -07:00
cls_matchall.c
net: sched: cls_matchall: Undo tcf_bind_filter in case of failure after mall_set_parms
2023-07-17 07:33:38 +01:00
cls_route.c
net/sched: cls_route: No longer copy tcf_result on update to avoid use-after-free
2023-07-31 20:10:37 -07:00
cls_u32.c
net: sched: cls_u32: Fix u32's systematic failure to free IDR entries for hnodes.
2024-11-22 15:38:32 +01:00
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
net: annotate data-races around sk->sk_lingertime
2023-08-21 07:41:57 +01:00
em_nbyte.c
net: sched: Return the correct errno code
2021-02-06 11:15:28 -08:00
em_text.c
net: sched: em_text: fix possible memory leak in em_text_destroy()
2024-01-10 17:16:49 +01:00
em_u32.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
ematch.c
net_sched: reject TCF_EM_SIMPLE case for complex ematch module
2022-12-19 09:43:18 +00:00
Kconfig
bpf: Add fd-based tcx multi-prog infra with link support
2023-07-19 10:07:27 -07:00
Makefile
net/sched: Retire rsvp classifier
2023-02-16 09:27:07 +01:00
sch_api.c
net_sched: Prevent creation of classes with TC_H_ROOT
2025-03-22 12:50:39 -07:00
sch_blackhole.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_cake.c
sched: sch_cake: add bounds checks to host bulk flow fairness counts
2025-01-17 13:36:15 +01:00
sch_cbs.c
net/sched: cbs: Fix integer overflow in cbs_set_port_rate()
2024-12-14 20:00:03 +01:00
sch_choke.c
net: sched: fix ordering of qlen adjustment
2024-12-27 13:58:41 +01:00
sch_codel.c
net: sched: remove redundant NULL check in change hook function
2022-09-01 08:06:45 +02:00
sch_drr.c
net/sched: sch_drr: warn about class in use while deleting
2023-08-01 10:47:24 +02:00
sch_etf.c
net: sched: etf: remove true check in etf_enable_offload()
2022-09-01 20:08:32 -07:00
sch_ets.c
net: sched: fix ets qdisc OOB Indexing
2025-02-01 18:37:54 +01:00
sch_fifo.c
pfifo_tail_enqueue: Drop new packet when sch->limit == 0
2025-03-13 12:58:40 +01:00
sch_fq_codel.c
Revert "net: sched: fq_codel: remove redundant resource cleanup in fq_codel_init()"
2022-10-19 13:47:09 +01:00
sch_fq_pie.c
net/sched: fq_pie: avoid stalls in fq_pie_timer()
2023-08-31 11:21:52 +02:00
sch_fq.c
net/sched: sch_fq: fix integer overflow of "credit"
2023-04-21 20:24:29 -07:00
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: fix races in netdev_tx_sent_queue()/dev_watchdog()
2024-11-01 01:58:29 +01:00
sch_gred.c
sched: address a potential NULL pointer dereference in the GRED scheduler.
2025-03-22 12:50:38 -07:00
sch_hfsc.c
net/sched: sch_hfsc: upgrade 'rt' to 'sc' when it becomes a inner curve
2023-10-18 18:08:28 -07:00
sch_hhf.c
net: sched: remove redundant NULL check in change hook function
2022-09-01 08:06:45 +02:00
sch_htb.c
net/sched: fix false lockdep warning on qdisc root lock
2024-06-27 13:49:02 +02:00
sch_ingress.c
bpf: Fix too early release of tcx_entry
2024-07-18 13:21:12 +02:00
sch_mq.c
net: sched: add rcu annotations around qdisc->qdisc_sleeping
2023-06-07 10:25:39 +01:00
sch_mqprio_lib.c
net/sched: mqprio: allow per-TC user input of FP adminStatus
2023-04-13 22:22:10 -07:00
sch_mqprio_lib.h
net/sched: mqprio: allow per-TC user input of FP adminStatus
2023-04-13 22:22:10 -07:00
sch_mqprio.c
net/sched: mqprio: Add length check for TCA_MQPRIO_{MAX/MIN}_RATE64
2023-07-26 22:08:14 -07:00
sch_multiq.c
net: sched: sch_multiq: fix possible OOB write in multiq_tune()
2024-06-21 14:38:16 +02:00
sch_netem.c
netem: Update sch->q.qlen before qdisc_tree_reduce_backlog()
2025-02-17 09:40:14 +01:00
sch_pie.c
net: sched: add rcu annotations around qdisc->qdisc_sleeping
2023-06-07 10:25:39 +01:00
sch_plug.c
net: sched: sch_qfq: Fix UAF in qfq_dequeue()
2023-09-05 08:54:12 +02:00
sch_prio.c
net/sched: use tc_qdisc_stats_dump() in qdisc
2022-09-22 17:34:10 -07:00
sch_qfq.c
net: sched: sch_qfq: Fix UAF in qfq_dequeue()
2023-09-05 08:54:12 +02:00
sch_red.c
net: sched: add rcu annotations around qdisc->qdisc_sleeping
2023-06-07 10:25:39 +01:00
sch_sfb.c
Merge tag 'net-6.1-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2022-10-20 17:24:59 -07:00
sch_sfq.c
net_sched: sch_sfq: don't allow 1 packet limit
2025-02-08 09:51:50 +01:00
sch_skbprio.c
net/sched: use tc_qdisc_stats_dump() in qdisc
2022-09-22 17:34:10 -07:00
sch_taprio.c
net: sched: use RCU read-side critical section in taprio_dump()
2024-11-01 01:58:30 +01:00
sch_tbf.c
net/sched: tbf: correct backlog statistic for GSO packets
2024-12-14 19:59:34 +01:00
sch_teql.c
net: sched: add rcu annotations around qdisc->qdisc_sleeping
2023-06-07 10:25:39 +01:00