==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:352 [inline]
BUG: KASAN: slab-out-of-bounds in bacpy+0x23/0x30 include/net/bluetooth/bluetooth.h:236
Read of size 6 at addr ffff8880a4aad2c6 by task kworker/u5:3/3948

CPU: 1 PID: 3948 Comm: kworker/u5:3 Not tainted 5.0.0+ #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci0 hci_rx_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x123/0x190 mm/kasan/generic.c:191
 memcpy+0x24/0x50 mm/kasan/common.c:132
 memcpy include/linux/string.h:352 [inline]
 bacpy+0x23/0x30 include/net/bluetooth/bluetooth.h:236
 hci_extended_inquiry_result_evt net/bluetooth/hci_event.c:4197 [inline]
 hci_event_packet+0x481b/0xa8e1 net/bluetooth/hci_event.c:5875
 hci_rx_work+0x440/0xaa0 net/bluetooth/hci_core.c:4458
 process_one_work+0x98e/0x1790 kernel/workqueue.c:2259
 worker_thread+0x98/0xe40 kernel/workqueue.c:2405
 kthread+0x357/0x430 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Allocated by task 9841:
 save_stack+0x45/0xd0 mm/kasan/common.c:75
 set_track mm/kasan/common.c:87 [inline]
 __kasan_kmalloc mm/kasan/common.c:497 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:511
 __do_kmalloc_node mm/slab.c:3686 [inline]
 __kmalloc_node_track_caller+0x4e/0x70 mm/slab.c:3700
 __kmalloc_reserve.isra.0+0x40/0xf0 net/core/skbuff.c:140
 __alloc_skb+0x10b/0x5e0 net/core/skbuff.c:208
 alloc_skb include/linux/skbuff.h:1011 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:339 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:180 [inline]
 vhci_write+0xc4/0x470 drivers/bluetooth/hci_vhci.c:299
 call_write_iter include/linux/fs.h:1869 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x613/0x8e0 fs/read_write.c:487
 vfs_write+0x20c/0x580 fs/read_write.c:549
 ksys_write+0xea/0x1f0 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 7305:
 save_stack+0x45/0xd0 mm/kasan/common.c:75
 set_track mm/kasan/common.c:87 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:459
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:467
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xcf/0x230 mm/slab.c:3821
 snd_seq_release+0xbd/0xf0 sound/core/seq/seq_clientmgr.c:370
 __fput+0x2df/0x8d0 fs/file_table.c:278
 ____fput+0x16/0x20 fs/file_table.c:309
 task_work_run+0x14a/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x90a/0x2fa0 kernel/exit.c:875
 do_group_exit+0x135/0x370 kernel/exit.c:979
 get_signal+0x399/0x1d50 kernel/signal.c:2575
 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a4aad0c0
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 6 bytes to the right of
 512-byte region [ffff8880a4aad0c0, ffff8880a4aad2c0)
The buggy address belongs to the page:
page:ffffea000292ab40 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0xffff8880a4aad840
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002a14d08 ffffea0002331d48 ffff88812c3f0940
raw: ffff8880a4aad840 ffff8880a4aad0c0 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a4aad180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a4aad200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880a4aad280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff8880a4aad300: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8880a4aad380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================