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linux/net/wireless
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Eric Dumazet d1cba2ea81 wifi: cfg80211: restrict NL80211_ATTR_TXQ_QUANTUM values 
syzbot is able to trigger softlockups, setting NL80211_ATTR_TXQ_QUANTUM
to 2^31.

We had a similar issue in sch_fq, fixed with commit
d9e15a2733 ("pkt_sched: fq: do not accept silly TCA_FQ_QUANTUM")

watchdog: BUG: soft lockup - CPU#1 stuck for 26s! [kworker/1:0:24]
Modules linked in:
irq event stamp: 131135
 hardirqs last  enabled at (131134): [<ffff80008ae8778c>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:85 [inline]
 hardirqs last  enabled at (131134): [<ffff80008ae8778c>] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:95
 hardirqs last disabled at (131135): [<ffff80008ae85378>] __el1_irq arch/arm64/kernel/entry-common.c:533 [inline]
 hardirqs last disabled at (131135): [<ffff80008ae85378>] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:551
 softirqs last  enabled at (125892): [<ffff80008907e82c>] neigh_hh_init net/core/neighbour.c:1538 [inline]
 softirqs last  enabled at (125892): [<ffff80008907e82c>] neigh_resolve_output+0x268/0x658 net/core/neighbour.c:1553
 softirqs last disabled at (125896): [<ffff80008904166c>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
CPU: 1 PID: 24 Comm: kworker/1:0 Not tainted 6.9.0-rc7-syzkaller-gfda5695d692c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: mld mld_ifc_work
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
 pc : __list_del include/linux/list.h:195 [inline]
 pc : __list_del_entry include/linux/list.h:218 [inline]
 pc : list_move_tail include/linux/list.h:310 [inline]
 pc : fq_tin_dequeue include/net/fq_impl.h:112 [inline]
 pc : ieee80211_tx_dequeue+0x6b8/0x3b4c net/mac80211/tx.c:3854
 lr : __list_del_entry include/linux/list.h:218 [inline]
 lr : list_move_tail include/linux/list.h:310 [inline]
 lr : fq_tin_dequeue include/net/fq_impl.h:112 [inline]
 lr : ieee80211_tx_dequeue+0x67c/0x3b4c net/mac80211/tx.c:3854
sp : ffff800093d36700
x29: ffff800093d36a60 x28: ffff800093d36960 x27: dfff800000000000
x26: ffff0000d800ad50 x25: ffff0000d800abe0 x24: ffff0000d800abf0
x23: ffff0000e0032468 x22: ffff0000e00324d4 x21: ffff0000d800abf0
x20: ffff0000d800abf8 x19: ffff0000d800abf0 x18: ffff800093d363c0
x17: 000000000000d476 x16: ffff8000805519dc x15: ffff7000127a6cc8
x14: 1ffff000127a6cc8 x13: 0000000000000004 x12: ffffffffffffffff
x11: ffff7000127a6cc8 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffff80009287aa08 x4 : 0000000000000008 x3 : ffff80008034c7fc
x2 : ffff0000e0032468 x1 : 00000000da0e46b8 x0 : ffff0000e0032470
Call trace:
  __list_del include/linux/list.h:195 [inline]
  __list_del_entry include/linux/list.h:218 [inline]
  list_move_tail include/linux/list.h:310 [inline]
  fq_tin_dequeue include/net/fq_impl.h:112 [inline]
  ieee80211_tx_dequeue+0x6b8/0x3b4c net/mac80211/tx.c:3854
  wake_tx_push_queue net/mac80211/util.c:294 [inline]
  ieee80211_handle_wake_tx_queue+0x118/0x274 net/mac80211/util.c:315
  drv_wake_tx_queue net/mac80211/driver-ops.h:1350 [inline]
  schedule_and_wake_txq net/mac80211/driver-ops.h:1357 [inline]
  ieee80211_queue_skb+0x18e8/0x2244 net/mac80211/tx.c:1664
  ieee80211_tx+0x260/0x400 net/mac80211/tx.c:1966
  ieee80211_xmit+0x278/0x354 net/mac80211/tx.c:2062
  __ieee80211_subif_start_xmit+0xab8/0x122c net/mac80211/tx.c:4338
  ieee80211_subif_start_xmit+0xe0/0x438 net/mac80211/tx.c:4532
  __netdev_start_xmit include/linux/netdevice.h:4903 [inline]
  netdev_start_xmit include/linux/netdevice.h:4917 [inline]
  xmit_one net/core/dev.c:3531 [inline]
  dev_hard_start_xmit+0x27c/0x938 net/core/dev.c:3547
  __dev_queue_xmit+0x1678/0x33fc net/core/dev.c:4341
  dev_queue_xmit include/linux/netdevice.h:3091 [inline]
  neigh_resolve_output+0x558/0x658 net/core/neighbour.c:1563
  neigh_output include/net/neighbour.h:542 [inline]
  ip6_finish_output2+0x104c/0x1ee8 net/ipv6/ip6_output.c:137
  ip6_finish_output+0x428/0x7a0 net/ipv6/ip6_output.c:222
  NF_HOOK_COND include/linux/netfilter.h:303 [inline]
  ip6_output+0x270/0x594 net/ipv6/ip6_output.c:243
  dst_output include/net/dst.h:450 [inline]
  NF_HOOK+0x160/0x4f0 include/linux/netfilter.h:314
  mld_sendpack+0x7b4/0x10f4 net/ipv6/mcast.c:1818
  mld_send_cr net/ipv6/mcast.c:2119 [inline]
  mld_ifc_work+0x840/0xd0c net/ipv6/mcast.c:2650
  process_one_work+0x7b8/0x15d4 kernel/workqueue.c:3267
  process_scheduled_works kernel/workqueue.c:3348 [inline]
  worker_thread+0x938/0xef4 kernel/workqueue.c:3429
  kthread+0x288/0x310 kernel/kthread.c:388
  ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860

Fixes: 52539ca89f ("cfg80211: Expose TXQ stats and parameters to userspace")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20240615160800.250667-1-edumazet@google.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-06-26 10:23:30 +02:00
..
certs wifi: cfg80211: fix certs build to not depend on file order 2023-12-14 09:11:51 +01:00
tests wifi: cfg80211: allow cfg80211_defragment_element() without output 2024-03-04 14:33:51 +01:00
.gitignore
ap.c wifi: cfg80211: remove wdev mutex 2023-09-11 11:27:23 +02:00
chan.c wifi: cfg80211: optionally support monitor on disabled channels 2024-02-12 21:22:48 +01:00
core.c wifi: cfg80211: fully move wiphy work to unbound workqueue 2024-05-29 15:23:33 +02:00
core.h wifi: cfg80211: optionally support monitor on disabled channels 2024-02-12 21:22:48 +01:00
debugfs.c wifi: cfg80211: add locked debugfs wrappers 2023-11-27 11:24:58 +01:00
debugfs.h
ethtool.c wifi: cfg80211: use strscpy to replace strlcpy 2022-07-15 11:43:12 +02:00
ibss.c wifi: cfg80211: remove wdev mutex 2023-09-11 11:27:23 +02:00
Kconfig wifi: cfg80211/mac80211: remove dependency on non-existing option 2024-01-18 14:50:01 +01:00
lib80211_crypt_ccmp.c wifi: use struct_group to copy addresses 2022-09-03 16:40:06 +02:00
lib80211_crypt_tkip.c wifi: lib80211: remove unused variables iv32 and iv16 2023-09-13 12:33:58 +02:00
lib80211_crypt_wep.c
lib80211.c
Makefile kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
mesh.c wifi: cfg80211: remove scan_width support 2023-09-13 11:10:50 +02:00
mlme.c wifi: cfg80211: validate MLO connections better 2024-01-26 09:39:49 +01:00
nl80211.c wifi: cfg80211: restrict NL80211_ATTR_TXQ_QUANTUM values 2024-06-26 10:23:30 +02:00
nl80211.h wifi: cfg80211: make RX assoc data const 2023-12-06 11:50:28 +01:00
ocb.c wifi: cfg80211: remove wdev mutex 2023-09-11 11:27:23 +02:00
of.c
pmsr.c wifi: cfg80211: pmsr: use correct nla_get_uX functions 2024-05-29 15:23:54 +02:00
radiotap.c mac80211: Use flex-array for radiotap header bitmap 2021-08-13 09:58:25 +02:00
rdev-ops.h wifi: cfg80211: fix 6 GHz scan request building 2024-05-29 15:25:25 +02:00
reg.c wifi: cfg80211: make some regulatory functions void 2024-04-19 10:28:25 +02:00
reg.h wifi: cfg80211: add return docs for regulatory functions 2024-04-19 10:29:08 +02:00
scan.c wifi: cfg80211: wext: add extra SIOCSIWSCAN data check 2024-06-12 10:07:56 +02:00
sme.c wifi: cfg80211: Clear mlo_links info when STA disconnects 2024-05-03 10:03:19 +02:00
sysfs.c wifi: cfg80211: fully move wiphy work to unbound workqueue 2024-05-29 15:23:33 +02:00
sysfs.h
trace.c
trace.h tracing/treewide: Remove second parameter of __assign_str() 2024-05-22 20:14:47 -04:00
util.c wifi: cfg80211: Lock wiphy in cfg80211_get_station 2024-05-29 15:23:41 +02:00
wext-compat.c wifi: cfg80211: wext: convert return value to kernel-doc 2023-10-23 11:45:17 +02:00
wext-compat.h wifi: cfg80211: Avoid clashing function prototypes 2022-11-16 11:31:47 +02:00
wext-core.c wifi: cfg80211: add a flag to disable wireless extensions 2024-03-25 15:23:06 +01:00
wext-priv.c
wext-proc.c
wext-sme.c wifi: cfg80211: remove wdev mutex 2023-09-11 11:27:23 +02:00
wext-spy.c wireless: wext-spy: Fix out-of-bounds warning 2021-06-23 10:57:17 +02:00