kobject: kobject_add_internal failed for queues (error: -2 parent: bnep0)
==================================================================
BUG: KASAN: slab-use-after-free in cfusbl_device_notify+0x16b/0x6b0 net/caif/caif_usb.c:142
Read of size 8 at addr ff[ 1038.335464][T17113] Read of size 8 at addr ffff88802d4e0dc8 by task syz.0.3498/17113

CPU: 0 UID: 0 PID: 17113 Comm: syz.0.3498 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 cfusbl_device_notify+0x16b/0x6b0 net/caif/caif_usb.c:142
 notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
 call_netdevice_notifiers net/core/dev.c:2301 [inline]
 register_netdevice+0x1361/0x1d10 net/core/dev.c:11528
 register_netdev+0x40/0x60 net/core/dev.c:11586
 bnep_add_connection+0x6e5/0xca0 net/bluetooth/bnep/core.c:624
 do_bnep_sock_ioctl+0x40b/0x650 net/bluetooth/bnep/sock.c:83
 sock_do_ioctl+0x101/0x320 net/socket.c:1313
 sock_ioctl+0x5c9/0x7f0 net/socket.c:1434
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f58c244c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f58c06a6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f58c26c5fa0 RCX: 00007f58c244c819
RDX: 0000200000000080 RSI: 00000000400442c8 RDI: 0000000000000005
RBP: 00007f58c06a6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f58c26c6038 R14: 00007f58c26c5fa0 R15: 00007ffc33995ac8
 </TASK>

Allocated by task 15577:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x3a6/0x690 mm/slub.c:5415
 kmalloc_noprof include/linux/slab.h:950 [inline]
 kzalloc_noprof include/linux/slab.h:1188 [inline]
 __hci_conn_add+0x3c4/0x1d80 net/bluetooth/hci_conn.c:963
 hci_conn_request_evt+0x655/0xe20 net/bluetooth/hci_event.c:3333
 hci_event_func net/bluetooth/hci_event.c:7773 [inline]
 hci_event_packet+0x6ab/0xef0 net/bluetooth/hci_event.c:7824
 hci_rx_work+0x3ee/0x1040 net/bluetooth/hci_core.c:4077
 process_one_work kernel/workqueue.c:3302 [inline]
 process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 17113:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2689 [inline]
 slab_free mm/slub.c:6246 [inline]
 kfree+0x1c5/0x6c0 mm/slub.c:6561
 device_release+0xc4/0x1f0 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x228/0x560 lib/kobject.c:737
 put_device drivers/base/core.c:3814 [inline]
 device_del+0x7be/0x900 drivers/base/core.c:3918
 netdev_register_kobject+0x2b2/0x310 net/core/net-sysfs.c:2349
 register_netdevice+0x12d7/0x1d10 net/core/dev.c:11470
 register_netdev+0x40/0x60 net/core/dev.c:11586
 bnep_add_connection+0x6e5/0xca0 net/bluetooth/bnep/core.c:624
 do_bnep_sock_ioctl+0x40b/0x650 net/bluetooth/bnep/sock.c:83
 sock_do_ioctl+0x101/0x320 net/socket.c:1313
 sock_ioctl+0x5c9/0x7f0 net/socket.c:1434
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Last potentially related work creation:
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 insert_work+0x3d/0x330 kernel/workqueue.c:2226
 __queue_work+0xcfd/0x1010 kernel/workqueue.c:2381
 queue_delayed_work_on+0x11a/0x1e0 kernel/workqueue.c:2600
 l2cap_chan_del+0x285/0x610 net/bluetooth/l2cap_core.c:672
 l2cap_conn_del+0x33d/0x570 net/bluetooth/l2cap_core.c:1802
 hci_disconn_cfm include/net/bluetooth/hci_core.h:2154 [inline]
 hci_conn_hash_flush+0x10d/0x260 net/bluetooth/hci_conn.c:2650
 hci_dev_close_sync+0x821/0x10e0 net/bluetooth/hci_sync.c:5368
 hci_dev_do_close net/bluetooth/hci_core.c:502 [inline]
 hci_unregister_dev+0x21a/0x5a0 net/bluetooth/hci_core.c:2716
 vhci_release+0x155/0x1b0 drivers/bluetooth/hci_vhci.c:690
 __fput+0x461/0xa70 fs/file_table.c:510
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x70f/0x22c0 kernel/exit.c:975
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1117
 get_signal+0x125c/0x1310 kernel/signal.c:3037
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802d4e0000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 3528 bytes inside of
 freed 8192-byte region [ffff88802d4e0000, ffff88802d4e2000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2d4e0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff88801a022280 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000
head: 0080000000000040 ffff88801a022280 dead000000000100 dead000000000122
head: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000
head: 0080000000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 16118, tgid 16118 (syz-executor), ts 972709666042, free_ts 972593506998
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1858
 prep_new_page mm/page_alloc.c:1866 [inline]
 get_page_from_freelist+0x27c8/0x2840 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226
 alloc_slab_page mm/slub.c:3278 [inline]
 allocate_slab+0x77/0x660 mm/slub.c:3467
 new_slab mm/slub.c:3525 [inline]
 refill_objects+0x33c/0x3d0 mm/slub.c:7251
 refill_sheaf mm/slub.c:2816 [inline]
 __pcs_replace_empty_main+0x373/0x720 mm/slub.c:4651
 alloc_from_pcs mm/slub.c:4749 [inline]
 slab_alloc_node mm/slub.c:4883 [inline]
 __do_kmalloc_node mm/slub.c:5294 [inline]
 __kvmalloc_node_noprof+0x6f4/0x8e0 mm/slub.c:6828
 kvmalloc_array_node_noprof include/linux/slab.h:1216 [inline]
 __ptr_ring_init_queue_alloc_noprof include/linux/ptr_ring.h:481 [inline]
 ptr_ring_init_noprof include/linux/ptr_ring.h:499 [inline]
 skb_array_init_noprof include/linux/skb_array.h:182 [inline]
 pfifo_fast_init+0x392/0x6f0 net/sched/sch_generic.c:895
 qdisc_create_dflt+0x13b/0x4e0 net/sched/sch_generic.c:1038
 attach_one_default_qdisc net/sched/sch_generic.c:1197 [inline]
 netdev_for_each_tx_queue include/linux/netdevice.h:2689 [inline]
 attach_default_qdiscs net/sched/sch_generic.c:1215 [inline]
 dev_activate+0x378/0x1150 net/sched/sch_generic.c:1274
 __dev_open+0x67a/0x830 net/core/dev.c:1711
 __dev_change_flags+0x1f7/0x690 net/core/dev.c:9810
 netif_change_flags+0x88/0x1a0 net/core/dev.c:9873
 do_setlink+0xf82/0x4590 net/core/rtnetlink.c:3180
 rtnl_changelink net/core/rtnetlink.c:3798 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3971 [inline]
 rtnl_newlink+0x15ad/0x1bb0 net/core/rtnetlink.c:4108
 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6994
page last free pid 1310 tgid 1310 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1402 [inline]
 __free_frozen_pages+0xfa6/0x10f0 mm/page_alloc.c:2943
 skb_free_frag include/linux/skbuff.h:3534 [inline]
 skb_free_head net/core/skbuff.c:1085 [inline]
 skb_release_data+0x8a5/0xa60 net/core/skbuff.c:1114
 skb_release_all net/core/skbuff.c:1189 [inline]
 __kfree_skb+0x5d/0x210 net/core/skbuff.c:1203
 batadv_forw_packet_free+0x65/0x1f0 net/batman-adv/send.c:458
 process_one_work kernel/workqueue.c:3302 [inline]
 process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff88802d4e0c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802d4e0d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802d4e0d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff88802d4e0e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802d4e0e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================