==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in atomic_fetch_sub_release include/asm-generic/atomic-instrumented.h:167 [inline]
BUG: KASAN: use-after-free in __refcount_sub_and_test include/linux/refcount.h:272 [inline]
BUG: KASAN: use-after-free in __refcount_dec_and_test include/linux/refcount.h:315 [inline]
BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:333 [inline]
BUG: KASAN: use-after-free in sock_put include/net/sock.h:1815 [inline]
BUG: KASAN: use-after-free in sco_conn_del+0x161/0x2a0 net/bluetooth/sco.c:205
Write of size 4 at addr ffff88801fd9c080 by task syz-executor.4/15533

CPU: 0 PID: 15533 Comm: syz-executor.4 Not tainted 5.14.0-rc4-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:105
 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:436
 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_sub_release include/asm-generic/atomic-instrumented.h:167 [inline]
 __refcount_sub_and_test include/linux/refcount.h:272 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 sock_put include/net/sock.h:1815 [inline]
 sco_conn_del+0x161/0x2a0 net/bluetooth/sco.c:205
 sco_disconn_cfm+0x71/0xb0 net/bluetooth/sco.c:1204
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1500 [inline]
 hci_conn_hash_flush+0x127/0x260 net/bluetooth/hci_conn.c:1608
 hci_dev_do_close+0x528/0x1130 net/bluetooth/hci_core.c:1778
 hci_unregister_dev+0x1c0/0x5a0 net/bluetooth/hci_core.c:4015
 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:340
 __fput+0x288/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xbd4/0x2a60 kernel/exit.c:825
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x47f/0x2160 kernel/signal.c:2808
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/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
RIP: 0033:0x4665d9
Code: Unable to access opcode bytes at RIP 0x4665af.
RSP: 002b:00007f5a0e112218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000056bf88 RCX: 00000000004665d9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf88
RBP: 000000000056bf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf8c
R13: 00007fff2b691f8f R14: 00007f5a0e112300 R15: 0000000000022000

Allocated by task 16375:
 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+0x9b/0xd0 mm/kasan/common.c:522
 kmalloc include/linux/slab.h:596 [inline]
 sk_prot_alloc+0x110/0x290 net/core/sock.c:1808
 sk_alloc+0x32/0xbc0 net/core/sock.c:1861
 sco_sock_alloc.constprop.0+0x31/0x220 net/bluetooth/sco.c:495
 sco_sock_create+0xd5/0x1b0 net/bluetooth/sco.c:530
 bt_sock_create+0x17c/0x340 net/bluetooth/af_bluetooth.c:130
 __sock_create+0x353/0x790 net/socket.c:1450
 sock_create net/socket.c:1501 [inline]
 __sys_socket+0xef/0x200 net/socket.c:1543
 __do_sys_socket net/socket.c:1552 [inline]
 __se_sys_socket net/socket.c:1550 [inline]
 __x64_sys_socket+0x6f/0xb0 net/socket.c:1550
 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

Freed by task 15533:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1625 [inline]
 slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1650
 slab_free mm/slub.c:3210 [inline]
 kfree+0xe4/0x530 mm/slub.c:4264
 sk_prot_free net/core/sock.c:1844 [inline]
 __sk_destruct+0x6a8/0x900 net/core/sock.c:1929
 sk_destruct+0xbd/0xe0 net/core/sock.c:1944
 __sk_free+0xef/0x3d0 net/core/sock.c:1955
 sk_free+0x78/0xa0 net/core/sock.c:1966
 sock_put include/net/sock.h:1816 [inline]
 sco_sock_kill+0x18d/0x1b0 net/bluetooth/sco.c:416
 sco_conn_del+0x153/0x2a0 net/bluetooth/sco.c:204
 sco_disconn_cfm+0x71/0xb0 net/bluetooth/sco.c:1204
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1500 [inline]
 hci_conn_hash_flush+0x127/0x260 net/bluetooth/hci_conn.c:1608
 hci_dev_do_close+0x528/0x1130 net/bluetooth/hci_core.c:1778
 hci_unregister_dev+0x1c0/0x5a0 net/bluetooth/hci_core.c:4015
 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:340
 __fput+0x288/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xbd4/0x2a60 kernel/exit.c:825
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x47f/0x2160 kernel/signal.c:2808
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/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

The buggy address belongs to the object at ffff88801fd9c000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 128 bytes inside of
 2048-byte region [ffff88801fd9c000, ffff88801fd9c800)
The buggy address belongs to the page:
page:ffffea00007f6600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fd98
head:ffffea00007f6600 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010842000
raw: 0000000000000000 0000000000080008 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 8831, ts 75291977433, free_ts 75271895652
 prep_new_page mm/page_alloc.c:2436 [inline]
 get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4169
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5391
 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244
 alloc_slab_page mm/slub.c:1688 [inline]
 allocate_slab+0x32e/0x4b0 mm/slub.c:1828
 new_slab mm/slub.c:1891 [inline]
 new_slab_objects mm/slub.c:2637 [inline]
 ___slab_alloc+0x4ba/0x820 mm/slub.c:2800
 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2840
 slab_alloc_node mm/slub.c:2922 [inline]
 __kmalloc_node_track_caller+0x2e3/0x360 mm/slub.c:4650
 kmalloc_reserve net/core/skbuff.c:355 [inline]
 __alloc_skb+0xde/0x340 net/core/skbuff.c:426
 alloc_skb include/linux/skbuff.h:1112 [inline]
 nlmsg_new include/net/netlink.h:953 [inline]
 inet6_ifinfo_notify+0x72/0x150 net/ipv6/addrconf.c:5973
 addrconf_notify+0x4c5/0x2400 net/ipv6/addrconf.c:3615
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2123
 call_netdevice_notifiers_extack net/core/dev.c:2135 [inline]
 call_netdevice_notifiers net/core/dev.c:2149 [inline]
 __dev_notify_flags+0x110/0x2b0 net/core/dev.c:8860
 dev_change_flags+0x112/0x170 net/core/dev.c:8898
 do_setlink+0x90a/0x3900 net/core/rtnetlink.c:2721
 __rtnl_newlink+0xddb/0x1760 net/core/rtnetlink.c:3393
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1346 [inline]
 free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1397
 free_unref_page_prepare mm/page_alloc.c:3332 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3411
 unfreeze_partials+0x17c/0x1d0 mm/slub.c:2418
 put_cpu_partial+0x13d/0x230 mm/slub.c:2454
 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+0x8e/0xa0 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:2956 [inline]
 kmem_cache_alloc_node+0x266/0x3e0 mm/slub.c:2992
 __alloc_skb+0x20b/0x340 net/core/skbuff.c:414
 alloc_skb include/linux/skbuff.h:1112 [inline]
 nlmsg_new include/net/netlink.h:953 [inline]
 inet_netconf_notify_devconf+0xdd/0x250 net/ipv4/devinet.c:2093
 __devinet_sysctl_unregister net/ipv4/devinet.c:2599 [inline]
 devinet_sysctl_unregister net/ipv4/devinet.c:2623 [inline]
 inetdev_event+0xe55/0x15d0 net/ipv4/devinet.c:1606
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2123
 call_netdevice_notifiers_extack net/core/dev.c:2135 [inline]
 call_netdevice_notifiers net/core/dev.c:2149 [inline]
 dev_change_name+0x447/0x690 net/core/dev.c:1406
 do_setlink+0x2b54/0x3900 net/core/rtnetlink.c:2701
 __rtnl_newlink+0xddb/0x1760 net/core/rtnetlink.c:3393

Memory state around the buggy address:
 ffff88801fd9bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801fd9c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801fd9c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88801fd9c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801fd9c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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