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linux/net/sched
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Victor Nogueira 0bf32d6fb1 net_sched: qfq: Fix double list add in class with netem as child qdisc 
[ Upstream commit f139f37dcd ]

As described in Gerrard's report [1], there are use cases where a netem
child qdisc will make the parent qdisc's enqueue callback reentrant.
In the case of qfq, there won't be a UAF, but the code will add the same
classifier to the list twice, which will cause memory corruption.

This patch checks whether the class was already added to the agg->active
list (cl_is_active) before doing the addition to cater for the reentrant
case.

[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/

Fixes: 37d9cf1a3c ("sched: Fix detection of empty queues in child qdiscs")
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Victor Nogueira <victor@mojatatu.com>
Link: https://patch.msgid.link/20250425220710.3964791-5-victor@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-05-09 09:39:39 +02:00
..
act_api.c net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc() 2024-07-05 09:14:30 +02:00
act_bpf.c flow_offload: fill flags to action structure 2023-02-22 12:57:10 +01:00
act_connmark.c flow_offload: fill flags to action structure 2023-02-22 12:57:10 +01:00
act_csum.c net_sched: refactor TC action init API 2021-08-02 10:24:38 +01:00
act_ct.c sched: act_ct: take care of padding in struct zones_ht_key 2024-08-19 05:45:31 +02:00
act_ctinfo.c net/sched: act_ctinfo: use percpu stats 2023-02-22 12:57:10 +01:00
act_gact.c net_sched: refactor TC action init API 2021-08-02 10:24:38 +01:00
act_gate.c flow_offload: fill flags to action structure 2023-02-22 12:57:10 +01:00
act_ife.c flow_offload: fill flags to action structure 2023-02-22 12:57:10 +01:00
act_ipt.c net/sched: act_ipt: add sanity checks on table name and hook locations 2023-07-23 13:47:28 +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 2025-05-09 09:39:37 +02:00
act_mpls.c net/sched: act_mpls: fix action bind logic 2023-03-11 13:57:30 +01:00
act_nat.c flow_offload: fill flags to action structure 2023-02-22 12:57:10 +01:00
act_pedit.c net/sched: act_pedit: Add size check for TCA_PEDIT_PARMS_EX 2023-07-23 13:47:29 +02:00
act_police.c net: sched: act_police: fix sparse errors in tcf_police_dump() 2023-06-14 11:13:03 +02:00
act_sample.c net/sched: act_sample: fix action bind logic 2023-03-11 13:57:30 +01:00
act_simple.c flow_offload: fill flags to action structure 2023-02-22 12:57:10 +01:00
act_skbedit.c flow_offload: fill flags to action structure 2023-02-22 12:57:10 +01:00
act_skbmod.c net/sched: act_skbmod: prevent kernel-infoleak 2024-04-10 16:19:38 +02:00
act_tunnel_key.c net: fix geneve_opt length integer overflow 2025-04-10 14:32:05 +02:00
act_vlan.c net_sched: refactor TC action init API 2021-08-02 10:24:38 +01:00
cls_api.c net/sched: cls_api: Fix lockup on flushing explicitly created chain 2023-06-21 15:59:18 +02:00
cls_basic.c net_sched: refactor TC action init API 2021-08-02 10:24:38 +01:00
cls_bpf.c net: sched: cls_bpf: Undo tcf_bind_filter in case of an error 2023-07-27 08:47:00 +02:00
cls_cgroup.c net_sched: refactor TC action init API 2021-08-02 10:24:38 +01:00
cls_flow.c net_sched: cls_flow: validate TCA_FLOW_RSHIFT attribute 2025-01-23 17:15:49 +01:00
cls_flower.c net: fix geneve_opt length integer overflow 2025-04-10 14:32:05 +02:00
cls_fw.c net/sched: cls_fw: No longer copy tcf_result on update to avoid use-after-free 2023-08-11 15:13:52 +02:00
cls_matchall.c net_sched: refactor TC action init API 2021-08-02 10:24:38 +01:00
cls_route.c net/sched: cls_route: No longer copy tcf_result on update to avoid use-after-free 2023-08-11 15:13:52 +02:00
cls_u32.c net: sched: cls_u32: Fix allocation size in u32_init() 2023-11-08 17:26:45 +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 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 net: sched: em_text: fix possible memory leak in em_text_destroy() 2024-01-15 18:51:12 +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 2022-12-31 13:14:39 +01:00
Kconfig net/sched: Retire dsmark qdisc 2024-03-01 13:21:42 +01:00
Makefile net/sched: Retire dsmark qdisc 2024-03-01 13:21:42 +01:00
sch_api.c net_sched: Prevent creation of classes with TC_H_ROOT 2025-04-10 14:31:49 +02:00
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 2025-03-13 12:51:12 +01:00
sch_cbs.c net/sched: cbs: Fix integer overflow in cbs_set_port_rate() 2024-12-14 19:51:36 +01:00
sch_choke.c net: sched: fix ordering of qlen adjustment 2025-01-09 13:28:29 +01:00
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: drr: Fix double list add in class with netem as child qdisc 2025-05-09 09:39:38 +02:00
sch_etf.c net: sched: delete duplicate cleanup of backlog and qlen 2022-10-29 10:12:57 +02:00
sch_ets.c net_sched: ets: Fix double list add in class with netem as child qdisc 2025-05-09 09:39:38 +02:00
sch_fifo.c pfifo_tail_enqueue: Drop new packet when sch->limit == 0 2025-03-13 12:51:00 +01:00
sch_fq.c net/sched: sch_fq: fix integer overflow of "credit" 2023-05-11 23:00:31 +09:00
sch_fq_codel.c net: sched: delete duplicate cleanup of backlog and qlen 2022-10-29 10:12:57 +02:00
sch_fq_pie.c net/sched: fq_pie: avoid stalls in fq_pie_timer() 2023-09-19 12:22:58 +02:00
sch_frag.c net/sched: Extend qdisc control block with tc control block 2022-01-05 12:42:33 +01:00
sch_generic.c net/sched: fix netdevice reference leaks in attach_default_qdiscs() 2022-09-08 12:28:02 +02:00
sch_gred.c net: sched: Fix spelling mistakes 2021-05-31 22:44:56 -07:00
sch_hfsc.c net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc 2025-05-09 09:39:38 +02:00
sch_hhf.c Revert "net: sched: Pass root lock to Qdisc_ops.enqueue" 2020-07-16 16:48:34 -07:00
sch_htb.c net: sched: sch: Fix off by one in htb_activate_prios() 2023-02-22 12:57:11 +01:00
sch_ingress.c net/sched: Reserve TC_H_INGRESS (TC_H_CLSACT) for ingress (clsact) Qdiscs 2023-06-09 10:32:17 +02:00
sch_mq.c net: sched: update default qdisc visibility after Tx queue cnt changes 2021-11-18 19:16:10 +01:00
sch_mqprio.c net/sched: mqprio: Add length check for TCA_MQPRIO_{MAX/MIN}_RATE64 2023-08-03 10:22:36 +02:00
sch_multiq.c net: sched: sch_multiq: fix possible OOB write in multiq_tune() 2024-07-05 09:14:06 +02:00
sch_netem.c netem: Update sch->q.qlen before qdisc_tree_reduce_backlog() 2025-03-13 12:50:23 +01:00
sch_pie.c net: sched: fix misspellings using misspell-fixer tool 2020-11-10 17:00:28 -08:00
sch_plug.c net: sched: sch_qfq: Fix UAF in qfq_dequeue() 2023-09-19 12:22:59 +02:00
sch_prio.c net: sched: delete duplicate cleanup of backlog and qlen 2022-10-29 10:12:57 +02:00
sch_qfq.c net_sched: qfq: Fix double list add in class with netem as child qdisc 2025-05-09 09:39:39 +02:00
sch_red.c net: sched: Fix use after free in red_enqueue() 2022-11-10 18:15:28 +01:00
sch_sfb.c net: sched: sfb: fix null pointer access issue when sfb_init() fails 2022-10-29 10:12:57 +02:00
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 net_sched: skbprio: Remove overly strict queue assertions 2025-04-10 14:32:04 +02:00
sch_taprio.c net: sched: fix use-after-free in taprio_change() 2024-11-01 01:52:37 +01:00
sch_tbf.c net/sched: tbf: correct backlog statistic for GSO packets 2024-12-14 19:51:27 +01:00
sch_teql.c net: sched: delete duplicate cleanup of backlog and qlen 2022-10-29 10:12:57 +02:00