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Zijie Huang a627d36c2a net/sched: reject overly deep qdisc hierarchies 
[ Upstream commit dedd34b0f2 ]

Deep qdisc hierarchies can lead to excessive recursion in qdisc tree
walkers and exhaust the kernel stack. The existing loop check does not
cover the create-and-graft path, so a hierarchy can still be extended by
creating a new child qdisc below an already deep parent.

Store the hierarchy depth in struct Qdisc and update it when qdiscs are
grafted. Reject new child qdiscs once the parent is already at the maximum
allowed depth.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Suggested-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reported-by: Vega <vega@nebusec.ai>
Assisted-by: Codex:gpt-5.4
Signed-off-by: Zijie Huang <milkory@outlook.com>
Signed-off-by: Ren Wei <enjou1224z@gmail.com>
Reviewed-by: Victor Nogueira <victor@mojatatu.com>
Link: https://patch.msgid.link/1e9ab39597423fd5d13cfaaf52279b8ee3d9fc3c.1785434373.git.milkory@outlook.com
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
[ Dropped the `extack` argument from the `notify_and_destroy()` context line to match 5.15's 6-parameter version. ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-08-27 14:28:19 +02:00
..
6lowpan 6lowpan: fix NHC entry use-after-free on error path 2026-07-24 15:51:20 +02:00
9p net/9p: fix infinite loop in p9_client_rpc on fatal signal 2026-07-24 15:51:50 +02:00
802 net/802/mrp: fix vector attribute parsing in mrp_pdu_parse_vecattr 2026-06-19 13:33:34 +02:00
8021q net: vlan: sync VLAN features with lower device 2025-12-07 06:09:26 +09:00
appletalk net: appletalk: Fix use-after-free in AARP proxy probe 2025-08-28 16:24:04 +02:00
atm net: atm: reject out-of-range traffic classes in QoS validation 2026-07-24 15:51:46 +02:00
ax25 ax25: properly unshare skbs in ax25_kiss_rcv() 2025-09-09 18:50:20 +02:00
batman-adv batman-adv: clean untagged VLAN on netdev registration failure 2026-07-24 15:51:53 +02:00
bluetooth Bluetooth: RFCOMM: take rfcomm_mutex for the deferred setup accept 2026-08-27 14:28:18 +02:00
bpf bpf: reject short IPv4/IPv6 inputs in bpf_prog_test_run_skb 2026-06-01 17:35:29 +02:00
bpfilter bpfilter: Specify the log level for the kmsg message 2021-06-25 13:13:50 +02:00
bridge netfilter: bridge: release template ct on non-IP path 2026-08-19 17:14:17 +02:00
caif net: caif: clear client service pointer on teardown 2026-06-01 17:35:14 +02:00
can can: j1939: transport: j1939_session_fresh_new(): initialize receive buffer 2026-08-19 17:14:11 +02:00
ceph libceph: fix two unsafe bare decodes in decode_lockers() 2026-08-23 14:17:28 +02:00
core net: pktgen: fix proc entry use-after-free 2026-08-23 14:17:29 +02:00
dcb net: dcb: choose correct policy to parse DCB_ATTR_BCN 2023-08-11 15:13:53 +02:00
dccp net: fix data-races around sk->sk_forward_alloc 2025-01-23 17:16:04 +01:00
dns_resolver keys, dns: Fix size check of V1 server-list header 2024-01-25 14:52:46 -08:00
dsa net: dsa: tag_ksz: do not rely on skb_mac_header() in TX paths 2026-07-24 15:51:27 +02:00
ethernet gro: remove rcu_read_lock/rcu_read_unlock from gro_complete handlers 2024-09-12 11:07:47 +02:00
ethtool ethtool: eeprom: add more safeties to EEPROM Netlink fallback 2026-06-19 13:33:24 +02:00
hsr net: hsr: fix memory leak on slave unregistration by removing synced VLANs 2026-08-19 17:13:58 +02:00
ieee802154 ieee802154: allow legacy LLSEC ADD/DEL ops to pass strict validation 2026-07-24 15:51:53 +02:00
ife net: ife: require ETH_HLEN to be pullable in ife_decode() 2026-07-24 15:51:46 +02:00
ipv4 net: ipip: require CAP_NET_ADMIN in the device netns for changelink 2026-08-23 14:17:23 +02:00
ipv6 net: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink 2026-08-23 14:17:24 +02:00
iucv net/iucv: fix use-after-free of a severed iucv_path 2026-08-19 17:14:04 +02:00
kcm kcm: use WRITE_ONCE() when changing lower socket callbacks 2026-07-24 15:51:36 +02:00
key net: af_key: initialize alg_key_len for IPComp states 2026-07-24 15:51:21 +02:00
l2tp l2tp: Drop large packets with UDP encap 2026-06-01 17:35:03 +02:00
l3mdev net: Add l3mdev index to flow struct and avoid oif reset for port devices 2024-10-17 15:11:57 +02:00
lapb net: lapb: Use list_for_each_entry() to simplify code in lapb_iface.c 2021-06-08 16:31:25 -07:00
llc llc: fix SAP refcount leak when creating incoming sockets 2026-07-24 15:51:55 +02:00
mac80211 wifi: mac80211: validate individual TWT params before driver setup 2026-08-19 17:14:07 +02:00
mac802154 mac802154: llsec: reject frames shorter than the authentication tag 2026-08-19 17:14:04 +02:00
mctp net: mctp: fix don't require received header reserved bits to be zero 2026-06-19 13:33:41 +02:00
mpls net: mpls: initialize rtm_tos in mpls_getroute() 2026-08-19 17:14:05 +02:00
mptcp mptcp: decrement subflows counter on failed passive join 2026-08-23 14:17:27 +02:00
ncsi net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length 2026-08-19 17:14:14 +02:00
netfilter netfilter: ipset: fix list type element drift bug 2026-08-23 14:17:31 +02:00
netlabel netlabel: validate unlabeled address and mask attribute lengths 2026-06-19 13:33:35 +02:00
netlink rtnetlink: add RTNL_FLAG_DUMP_UNLOCKED flag 2026-07-24 15:51:42 +02:00
netrom netrom: fix double-free in nr_route_frame() 2026-02-06 16:41:58 +01:00
nfc nfc: llcp: protect nfc_llcp_sock_unlink() calls 2026-07-24 15:51:15 +02:00
nsh nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment(). 2024-05-17 11:50:48 +02:00
openvswitch openvswitch: move key and ovs_cb update out of handle_fragments 2026-08-23 14:17:30 +02:00
packet packet: use consistent hard_header_len in TX_RING send path 2026-08-27 14:28:19 +02:00
phonet phonet: pep: fix use-after-free in pep_get_sb() 2026-08-19 17:14:03 +02:00
psample net: psample: fix info leak in PSAMPLE_ATTR_DATA 2026-07-24 15:51:39 +02:00
qrtr net: qrtr: ns: Raise lookup limit to 128 2026-08-19 17:14:14 +02:00
rds rds: tcp: hold the RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check() 2026-08-19 17:14:06 +02:00
rfkill net: rfkill: prevent unlimited numbers of rfkill events from being created 2026-04-18 10:33:38 +02:00
rose net/rose: fix NULL pointer dereference in rose_transmit_link on reconnect 2026-04-18 10:33:20 +02:00
rxrpc rxrpc: serialize kernel accept preallocation with socket teardown 2026-08-23 14:17:18 +02:00
sched net/sched: reject overly deep qdisc hierarchies 2026-08-27 14:28:19 +02:00
sctp sctp: avoid auth_enable sysctl UAF during netns teardown 2026-08-23 14:17:27 +02:00
smc net: smc: fix splice entry lifetime imbalance in smc_rx_splice 2026-08-23 14:17:30 +02:00
strparser net: strparser: fix skb_head leak in strp_abort_strp() 2026-06-01 17:35:14 +02:00
sunrpc xprtrdma: Fix bcall rep leak and unbounded peek 2026-07-24 15:51:38 +02:00
switchdev net: make switchdev_bridge_port_{,unoffload} loosely coupled with the bridge 2021-08-04 12:35:07 +01:00
tipc tipc: restrict socket queue dumps in enqueue tracepoints 2026-08-23 14:17:18 +02:00
tls tls: don't abort the connection on signal-interrupted sends 2026-08-19 17:14:14 +02:00
unix af_unix: Reject SIOCATMARK on non-stream sockets 2026-07-04 13:39:37 +02:00
vmw_vsock vsock/virtio: avoid refilling the RX queue after teardown 2026-08-19 17:14:17 +02:00
wireless wifi: cfg80211: bound element ID read when checking non-inheritance 2026-08-19 17:13:53 +02:00
x25 net/x25: fix use-after-free of the socket by its timers 2026-08-23 14:17:31 +02:00
xdp xsk: tighten UMEM headroom validation to account for tailroom and min frame 2026-06-01 17:35:02 +02:00
xfrm espintcp: use sk_msg_free_partial to fix partial send 2026-08-23 14:17:24 +02:00
compat.c use less confusing names for iov_iter direction initializers 2026-06-19 13:33:46 +02:00
devres.c net: devres: Correct a grammatical error 2021-06-11 12:55:28 -07:00
Kconfig Remove DECnet support from kernel 2023-06-21 15:59:15 +02:00
Makefile Remove DECnet support from kernel 2023-06-21 15:59:15 +02:00
socket.c net: Drop the lock in skb_may_tx_timestamp() 2026-07-24 15:51:21 +02:00
sysctl_net.c net: Ensure net namespace isolation of sysctls 2021-04-12 13:27:11 -07:00