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BUG: KASAN: use-after-free in __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
Read of size 8 at addr ffff8880913491a0 by task syz-executor.1/14743

CPU: 1 PID: 14743 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144
 spin_lock include/linux/spinlock.h:329 [inline]
 sco_conn_del+0xbb/0x1a0 net/bluetooth/sco.c:194
 sco_disconn_cfm+0x74/0xb0 net/bluetooth/sco.c:1150
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1263 [inline]
 hci_conn_hash_flush+0x127/0x260 net/bluetooth/hci_conn.c:1512
 hci_dev_do_close+0x6bc/0x1020 net/bluetooth/hci_core.c:1687
 hci_rfkill_set_block+0xe7/0x160 net/bluetooth/hci_core.c:2121
 rfkill_set_block+0x1f9/0x540 net/rfkill/core.c:353
 rfkill_fop_write+0x250/0x4a0 net/rfkill/core.c:1249
 do_loop_readv_writev fs/read_write.c:704 [inline]
 do_loop_readv_writev fs/read_write.c:688 [inline]
 do_iter_write+0x461/0x5d0 fs/read_write.c:962
 vfs_writev+0x153/0x2e0 fs/read_write.c:1005
 do_writev+0x136/0x330 fs/read_write.c:1040
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f7ea448aae9
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:00007f7ea1a00188 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f7ea459df60 RCX: 00007f7ea448aae9
RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000006
RBP: 00007f7ea44e4f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda3d4198f R14: 00007f7ea1a00300 R15: 0000000000022000

Allocated by task 14679:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15a/0x3c0 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 sk_prot_alloc+0x1e2/0x2d0 net/core/sock.c:1483
 sk_alloc+0x36/0xec0 net/core/sock.c:1537
 sco_sock_alloc.constprop.0+0x31/0x200 net/bluetooth/sco.c:480
 sco_sock_create+0xd5/0x180 net/bluetooth/sco.c:515
 bt_sock_create+0x154/0x2a0 net/bluetooth/af_bluetooth.c:130
 __sock_create+0x3d8/0x740 net/socket.c:1365
 sock_create net/socket.c:1416 [inline]
 __sys_socket+0xef/0x200 net/socket.c:1458
 __do_sys_socket net/socket.c:1467 [inline]
 __se_sys_socket net/socket.c:1465 [inline]
 __x64_sys_socket+0x6f/0xb0 net/socket.c:1465
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 14743:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 sk_prot_free net/core/sock.c:1520 [inline]
 __sk_destruct+0x684/0x8a0 net/core/sock.c:1602
 sk_destruct net/core/sock.c:1617 [inline]
 __sk_free+0x165/0x3b0 net/core/sock.c:1628
 sk_free+0x3b/0x50 net/core/sock.c:1639
 sock_put include/net/sock.h:1713 [inline]
 sco_conn_del+0x177/0x1a0 net/bluetooth/sco.c:198
 sco_disconn_cfm+0x74/0xb0 net/bluetooth/sco.c:1150
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1263 [inline]
 hci_conn_hash_flush+0x127/0x260 net/bluetooth/hci_conn.c:1512
 hci_dev_do_close+0x6bc/0x1020 net/bluetooth/hci_core.c:1687
 hci_rfkill_set_block+0xe7/0x160 net/bluetooth/hci_core.c:2121
 rfkill_set_block+0x1f9/0x540 net/rfkill/core.c:353
 rfkill_fop_write+0x250/0x4a0 net/rfkill/core.c:1249
 do_loop_readv_writev fs/read_write.c:704 [inline]
 do_loop_readv_writev fs/read_write.c:688 [inline]
 do_iter_write+0x461/0x5d0 fs/read_write.c:962
 vfs_writev+0x153/0x2e0 fs/read_write.c:1005
 do_writev+0x136/0x330 fs/read_write.c:1040
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff888091349100
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 160 bytes inside of
 2048-byte region [ffff888091349100, ffff888091349900)
The buggy address belongs to the page:
page:ffffea000244d200 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0xffff888091348880 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffffea00025ba108 ffffea0002a6f308 ffff88813bff0c40
raw: ffff888091348880 ffff888091348000 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888091349080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888091349100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888091349180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff888091349200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888091349280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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