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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:355 [inline]
BUG: KASAN: slab-out-of-bounds in bacpy+0x23/0x30 include/net/bluetooth/bluetooth.h:236
Read of size 6 at addr ffff8880a82ffe7b by task kworker/u5:1/7668

CPU: 0 PID: 7668 Comm: kworker/u5:1 Not tainted 5.1.0-rc7+ #96
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:355 [inline]
 bacpy+0x23/0x30 include/net/bluetooth/bluetooth.h:236
 hci_inquiry_result_with_rssi_evt net/bluetooth/hci_event.c:3986 [inline]
 hci_event_packet+0x4e86/0xaabf net/bluetooth/hci_event.c:5863
 hci_rx_work+0x440/0xaa0 net/bluetooth/hci_core.c:4458
 process_one_work+0x98e/0x1790 kernel/workqueue.c:2269
 worker_thread+0x98/0xe40 kernel/workqueue.c:2415
 kthread+0x357/0x430 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Allocated by task 7858:
 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:3687 [inline]
 __kmalloc_node_track_caller+0x4e/0x70 mm/slab.c:3701
 __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:1058 [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:1866 [inline]
 new_sync_write+0x4c7/0x760 fs/read_write.c:474
 __vfs_write+0xe4/0x110 fs/read_write.c:487
 vfs_write+0x20c/0x580 fs/read_write.c:549
 ksys_write+0x14f/0x2d0 fs/read_write.c:599
 __do_sys_write fs/read_write.c:611 [inline]
 __se_sys_write fs/read_write.c:608 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:608
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 6425:
 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:3499 [inline]
 kfree+0xcf/0x230 mm/slab.c:3822
 free_bprm+0x1b6/0x220 fs/exec.c:1432
 __do_execve_file.isra.0+0x1bea/0x23f0 fs/exec.c:1829
 do_execveat_common fs/exec.c:1865 [inline]
 do_execve fs/exec.c:1882 [inline]
 __do_sys_execve fs/exec.c:1958 [inline]
 __se_sys_execve fs/exec.c:1953 [inline]
 __x64_sys_execve+0x8f/0xc0 fs/exec.c:1953
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a82ffc80
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 507 bytes inside of
 512-byte region [ffff8880a82ffc80, ffff8880a82ffe80)
The buggy address belongs to the page:
page:ffffea0002a0bfc0 count:1 mapcount:0 mapping:ffff8880aa400940 index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002a0c088 ffffea0002a14948 ffff8880aa400940
raw: 0000000000000000 ffff8880a82ff000 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a82ffd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a82ffe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880a82ffe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8880a82fff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a82fff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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