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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:372 [inline]
BUG: KASAN: slab-out-of-bounds in hci_inquiry_result_evt net/bluetooth/hci_event.c:2112 [inline]
BUG: KASAN: slab-out-of-bounds in hci_event_packet+0x35fc/0x7c7a net/bluetooth/hci_event.c:5278
Read of size 3 at addr ffff8880a8fd173f by task kworker/u5:2/7771

CPU: 1 PID: 7771 Comm: kworker/u5:2 Not tainted 4.14.191-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci4 hci_rx_work
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351
 kasan_report+0x6f/0x7b mm/kasan/report.c:409
 memcpy+0x20/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:372 [inline]
 hci_inquiry_result_evt net/bluetooth/hci_event.c:2112 [inline]
 hci_event_packet+0x35fc/0x7c7a net/bluetooth/hci_event.c:5278
 hci_rx_work+0x3e6/0x970 net/bluetooth/hci_core.c:4244
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Allocated by task 24682:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 __do_kmalloc_node mm/slab.c:3682 [inline]
 __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3696
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 __alloc_skb+0x96/0x510 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:980 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:336 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:180 [inline]
 vhci_write+0xb1/0x420 drivers/bluetooth/hci_vhci.c:299
 call_write_iter include/linux/fs.h:1778 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x44c/0x630 fs/read_write.c:482
 vfs_write+0x17f/0x4d0 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xf2/0x210 fs/read_write.c:582
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 22261:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 skb_free_head net/core/skbuff.c:554 [inline]
 skb_release_data+0x5f6/0x820 net/core/skbuff.c:574
 skb_release_all net/core/skbuff.c:631 [inline]
 __kfree_skb net/core/skbuff.c:645 [inline]
 consume_skb+0xe0/0x380 net/core/skbuff.c:705
 netlink_broadcast_filtered+0x2ab/0x9e0 net/netlink/af_netlink.c:1489
 kobject_uevent_env+0x851/0xcb0 lib/kobject_uevent.c:495
 rx_queue_add_kobject net/core/net-sysfs.c:931 [inline]
 net_rx_queue_update_kobjects+0xce/0x3e0 net/core/net-sysfs.c:953
 register_queue_kobjects net/core/net-sysfs.c:1401 [inline]
 netdev_register_kobject+0x26b/0x3a0 net/core/net-sysfs.c:1612
 register_netdevice+0x955/0xe40 net/core/dev.c:7659
 br_dev_newlink+0x23/0x100 net/bridge/br_netlink.c:1226
 rtnl_newlink+0xf88/0x1830 net/core/rtnetlink.c:2728
 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4316
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2433
 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1313
 netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff8880a8fd1540
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 511 bytes inside of
 512-byte region [ffff8880a8fd1540, ffff8880a8fd1740)
The buggy address belongs to the page:
page:ffffea0002a3f440 count:1 mapcount:0 mapping:ffff8880a8fd1040 index:0x0
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff8880a8fd1040 0000000000000000 0000000100000006
raw: ffffea00027ba2a0 ffffea000253a920 ffff88812fe52940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a8fd1600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a8fd1680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880a8fd1700: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff8880a8fd1780: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8880a8fd1800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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