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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:426 [inline]
BUG: KASAN: slab-out-of-bounds in bacpy+0x23/0x30 include/net/bluetooth/bluetooth.h:238
Read of size 6 at addr ffff8880a6ce3e08 by task kworker/u5:1/10107

CPU: 0 PID: 10107 Comm: kworker/u5:1 Not tainted 5.5.0-rc5-next-20200107-syzkaller #0
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+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x32 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:641
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
 memcpy+0x24/0x50 mm/kasan/common.c:127
 memcpy include/linux/string.h:426 [inline]
 bacpy+0x23/0x30 include/net/bluetooth/bluetooth.h:238
 hci_extended_inquiry_result_evt net/bluetooth/hci_event.c:4281 [inline]
 hci_event_packet+0x5efc/0xa991 net/bluetooth/hci_event.c:5984
 hci_rx_work+0x4b7/0xb20 net/bluetooth/hci_core.c:4491
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2264
 worker_thread+0x98/0xe40 kernel/workqueue.c:2410
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 10125:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc mm/kasan/common.c:515 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:488
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:529
 __do_kmalloc_node mm/slab.c:3616 [inline]
 __kmalloc_node_track_caller+0x4e/0x70 mm/slab.c:3630
 __kmalloc_reserve.isra.0+0x40/0xf0 net/core/skbuff.c:141
 __alloc_skb+0x10b/0x5e0 net/core/skbuff.c:209
 alloc_skb include/linux/skbuff.h:1049 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:341 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:165 [inline]
 vhci_write+0xc4/0x470 drivers/bluetooth/hci_vhci.c:284
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write+0x4d3/0x770 fs/read_write.c:483
 __vfs_write+0xe1/0x110 fs/read_write.c:496
 vfs_write+0x268/0x5d0 fs/read_write.c:558
 ksys_write+0x14f/0x290 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:620
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8986:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:337 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:476
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:485
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3757
 tomoyo_supervisor+0x2fe/0xe60 security/tomoyo/common.c:2149
 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline]
 tomoyo_path_permission security/tomoyo/file.c:587 [inline]
 tomoyo_path_permission+0x263/0x360 security/tomoyo/file.c:573
 tomoyo_path_perm+0x318/0x430 security/tomoyo/file.c:838
 tomoyo_inode_getattr+0x1d/0x30 security/tomoyo/tomoyo.c:129
 security_inode_getattr+0xf2/0x150 security/security.c:1255
 vfs_getattr+0x25/0x70 fs/stat.c:117
 vfs_statx_fd+0x71/0xc0 fs/stat.c:147
 vfs_fstat include/linux/fs.h:3264 [inline]
 __do_sys_newfstat+0x9b/0x120 fs/stat.c:388
 __se_sys_newfstat fs/stat.c:385 [inline]
 __x64_sys_newfstat+0x54/0x80 fs/stat.c:385
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a6ce3c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 8 bytes to the right of
 512-byte region [ffff8880a6ce3c00, ffff8880a6ce3e00)
The buggy address belongs to the page:
page:ffffea00029b38c0 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0
raw: 00fffe0000000200 ffffea00029fbd48 ffffea0002633fc8 ffff8880aa400a80
raw: 0000000000000000 ffff8880a6ce3000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a6ce3d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a6ce3d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880a6ce3e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff8880a6ce3e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a6ce3f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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