nla_parse: 9 callbacks suppressed
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'.
==================================================================
BUG: KASAN: use-after-free in atomic_inc include/asm-generic/atomic-instrumented.h:109 [inline]
BUG: KASAN: use-after-free in hci_sock_bind+0x522/0x1300 net/bluetooth/hci_sock.c:1226
Write of size 4 at addr ffff88809adbd460 by task syz-executor.4/9935

CPU: 1 PID: 9935 Comm: syz-executor.4 Not tainted 4.19.134-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/0x2fe lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354
 kasan_report+0x8f/0x96 mm/kasan/report.c:412
 atomic_inc include/asm-generic/atomic-instrumented.h:109 [inline]
 hci_sock_bind+0x522/0x1300 net/bluetooth/hci_sock.c:1226
 __sys_bind+0x1e9/0x250 net/socket.c:1482
 __do_sys_bind net/socket.c:1493 [inline]
 __se_sys_bind net/socket.c:1491 [inline]
 __x64_sys_bind+0x6f/0xb0 net/socket.c:1491
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c369
Code: 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f73cca08c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 0000000000000b40 RCX: 000000000045c369
RDX: 0000000000000006 RSI: 00000000200000c0 RDI: 0000000000000004
RBP: 00007f73cca08ca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffc7ed62cff R14: 00007f73cca099c0 R15: 000000000078bf0c

Allocated by task 9935:
 kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625
 kmalloc include/linux/slab.h:515 [inline]
 kzalloc include/linux/slab.h:709 [inline]
 hci_alloc_dev+0x3e/0x1cf0 net/bluetooth/hci_core.c:3053
 __vhci_create_device+0xf7/0x580 drivers/bluetooth/hci_vhci.c:114
 vhci_create_device drivers/bluetooth/hci_vhci.c:163 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:219 [inline]
 vhci_write+0x2bc/0x450 drivers/bluetooth/hci_vhci.c:299
 call_write_iter include/linux/fs.h:1821 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x51b/0x770 fs/read_write.c:487
 vfs_write+0x1f3/0x540 fs/read_write.c:549
 ksys_write+0x12b/0x2a0 fs/read_write.c:599
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 9929:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 bt_host_release+0x15/0x20 net/bluetooth/hci_sysfs.c:86
 device_release+0x76/0x210 drivers/base/core.c:1061
 kobject_cleanup lib/kobject.c:662 [inline]
 kobject_release lib/kobject.c:691 [inline]
 kref_put include/linux/kref.h:70 [inline]
 kobject_put+0x22d/0x350 lib/kobject.c:708
 put_device+0x1c/0x30 drivers/base/core.c:2251
 vhci_release+0x78/0xe0 drivers/bluetooth/hci_vhci.c:355
 __fput+0x2ce/0x890 fs/file_table.c:278
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809adbc400
 which belongs to the cache kmalloc-8192 of size 8192
The buggy address is located 4192 bytes inside of
 8192-byte region [ffff88809adbc400, ffff88809adbe400)
The buggy address belongs to the page:
page:ffffea00026b6f00 count:1 mapcount:0 mapping:ffff88812c395080 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffffea0001143b08 ffffea0002698608 ffff88812c395080
raw: 0000000000000000 ffff88809adbc400 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809adbd300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809adbd380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809adbd400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff88809adbd480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809adbd500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'.
IPVS: ftp: loaded support on port[0] = 21