==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:111 [inline]
BUG: KASAN: use-after-free in __refcount_add include/linux/refcount.h:193 [inline]
BUG: KASAN: use-after-free in __refcount_inc include/linux/refcount.h:250 [inline]
BUG: KASAN: use-after-free in refcount_inc include/linux/refcount.h:267 [inline]
BUG: KASAN: use-after-free in sock_hold include/net/sock.h:702 [inline]
BUG: KASAN: use-after-free in sco_conn_del+0xbe/0x2c0 net/bluetooth/sco.c:193
Write of size 4 at addr ffff888070ed7080 by task syz-executor.2/32686

CPU: 1 PID: 32686 Comm: syz-executor.2 Not tainted 5.15.0-rc1-next-20210915-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:111 [inline]
 __refcount_add include/linux/refcount.h:193 [inline]
 __refcount_inc include/linux/refcount.h:250 [inline]
 refcount_inc include/linux/refcount.h:267 [inline]
 sock_hold include/net/sock.h:702 [inline]
 sco_conn_del+0xbe/0x2c0 net/bluetooth/sco.c:193
 sco_disconn_cfm+0x71/0xb0 net/bluetooth/sco.c:1372
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1541 [inline]
 hci_conn_hash_flush+0x127/0x260 net/bluetooth/hci_conn.c:1742
 hci_dev_do_close+0x57d/0x1150 net/bluetooth/hci_core.c:1796
 hci_rfkill_set_block+0x19c/0x1d0 net/bluetooth/hci_core.c:2237
 rfkill_set_block+0x1f9/0x540 net/rfkill/core.c:344
 rfkill_fop_write+0x267/0x500 net/rfkill/core.c:1268
 vfs_write+0x28e/0xae0 fs/read_write.c:592
 ksys_write+0x1ee/0x250 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7c3d52f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 0000000000000008 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fffb0bbfa8f R14: 00007f7c3d52f300 R15: 0000000000022000

Allocated by task 32172:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 ____kasan_kmalloc mm/kasan/common.c:472 [inline]
 __kasan_kmalloc+0xa4/0xd0 mm/kasan/common.c:522
 kmalloc_node include/linux/slab.h:618 [inline]
 kzalloc_node include/linux/slab.h:743 [inline]
 qdisc_alloc+0xac/0xb10 net/sched/sch_generic.c:888
 qdisc_create_dflt+0x71/0x4a0 net/sched/sch_generic.c:950
 mq_init+0x358/0x4b0 net/sched/sch_mq.c:90
 qdisc_create_dflt+0x101/0x4a0 net/sched/sch_generic.c:957
 attach_default_qdiscs net/sched/sch_generic.c:1120 [inline]
 dev_activate+0x809/0xa70 net/sched/sch_generic.c:1171
 __dev_open+0x380/0x4d0 net/core/dev.c:1493
 __dev_change_flags+0x583/0x750 net/core/dev.c:8757
 dev_change_flags+0x93/0x170 net/core/dev.c:8828
 dev_ifsioc+0xb22/0x10c0 net/core/dev_ioctl.c:324
 dev_ioctl+0x1b9/0xee0 net/core/dev_ioctl.c:587
 sock_do_ioctl+0x15a/0x230 net/socket.c:1132
 sock_ioctl+0x2f1/0x640 net/socket.c:1235
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:2985 [inline]
 call_rcu+0xb1/0x740 kernel/rcu/tree.c:3065
 qdisc_put+0xcd/0xe0 net/sched/sch_generic.c:1044
 shutdown_scheduler_queue net/sched/sch_generic.c:1386 [inline]
 netdev_for_each_tx_queue include/linux/netdevice.h:2357 [inline]
 dev_shutdown+0x11b/0x4a0 net/sched/sch_generic.c:1392
 unregister_netdevice_many+0x818/0x1790 net/core/dev.c:11032
 unregister_netdevice_queue+0x2dd/0x3c0 net/core/dev.c:10973
 unregister_netdevice include/linux/netdevice.h:2988 [inline]
 __tun_detach+0x10ad/0x13d0 drivers/net/tun.c:670
 tun_detach drivers/net/tun.c:687 [inline]
 tun_chr_close+0xc4/0x180 drivers/net/tun.c:3397
 __fput+0x288/0x9f0 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Second to last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:2985 [inline]
 call_rcu+0xb1/0x740 kernel/rcu/tree.c:3065
 netlink_release+0xdd4/0x1dd0 net/netlink/af_netlink.c:812
 __sock_release net/socket.c:649 [inline]
 sock_release+0x87/0x1b0 net/socket.c:677
 netlink_kernel_release+0x4b/0x60 net/netlink/af_netlink.c:2117
 xfrm_user_net_exit+0x62/0xb0 net/xfrm/xfrm_user.c:3565
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:591
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff888070ed7000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 128 bytes inside of
 2048-byte region [ffff888070ed7000, ffff888070ed7800)
The buggy address belongs to the page:
page:ffffea0001c3b400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888070ed2000 pfn:0x70ed0
head:ffffea0001c3b400 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001cc5408 ffffea0000748608 ffff888010c42000
raw: ffff888070ed2000 0000000000080006 00000001ffffffff 0000000000000000
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_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6537, ts 152398732055, free_ts 152395044261
 prep_new_page mm/page_alloc.c:2424 [inline]
 get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4153
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5375
 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2197
 alloc_slab_page mm/slub.c:1763 [inline]
 allocate_slab mm/slub.c:1900 [inline]
 new_slab+0x319/0x490 mm/slub.c:1963
 ___slab_alloc+0x921/0xfe0 mm/slub.c:2994
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3081
 slab_alloc_node mm/slub.c:3172 [inline]
 __kmalloc_node_track_caller+0x2d2/0x340 mm/slub.c:4936
 kmalloc_reserve net/core/skbuff.c:352 [inline]
 pskb_expand_head+0x15e/0x1060 net/core/skbuff.c:1697
 netlink_trim+0x1ea/0x240 net/netlink/af_netlink.c:1296
 netlink_broadcast_filtered+0x65/0xdc0 net/netlink/af_netlink.c:1501
 netlink_broadcast net/netlink/af_netlink.c:1546 [inline]
 nlmsg_multicast include/net/netlink.h:1033 [inline]
 nlmsg_notify+0x94/0x290 net/netlink/af_netlink.c:2547
 rtnl_notify net/core/rtnetlink.c:730 [inline]
 rtmsg_ifinfo_send net/core/rtnetlink.c:3833 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:3848 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:3836 [inline]
 rtnetlink_event+0x193/0x1d0 net/core/rtnetlink.c:5623
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1996
 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline]
 call_netdevice_notifiers net/core/dev.c:2022 [inline]
 dev_change_name+0x517/0x7b0 net/core/dev.c:1279
 do_setlink+0x2bba/0x3970 net/core/rtnetlink.c:2699
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1338 [inline]
 free_pcp_prepare+0x373/0x860 mm/page_alloc.c:1389
 free_unref_page_prepare mm/page_alloc.c:3315 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3394
 __unfreeze_partials+0x340/0x360 mm/slub.c:2495
 qlink_free mm/kasan/quarantine.c:146 [inline]
 qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
 __kasan_slab_alloc+0x95/0xb0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook mm/slab.h:519 [inline]
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3214 [inline]
 kmem_cache_alloc+0x209/0x390 mm/slub.c:3219
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
 getname_flags+0x9a/0xe0 include/linux/audit.h:319
 user_path_at_empty+0x2b/0x60 fs/namei.c:2800
 do_readlinkat+0xcd/0x2f0 fs/stat.c:443
 __do_sys_readlinkat fs/stat.c:470 [inline]
 __se_sys_readlinkat fs/stat.c:467 [inline]
 __x64_sys_readlinkat+0x93/0xf0 fs/stat.c:467
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Memory state around the buggy address:
 ffff888070ed6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888070ed7000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888070ed7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888070ed7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888070ed7180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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