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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:406 [inline]
BUG: KASAN: slab-out-of-bounds in bacpy include/net/bluetooth/bluetooth.h:274 [inline]
BUG: KASAN: slab-out-of-bounds in hci_extended_inquiry_result_evt.isra.0+0x1be/0x5e0 net/bluetooth/hci_event.c:4394
Read of size 6 at addr ffff88801d217404 by task kworker/u18:0/1573

CPU: 3 PID: 1573 Comm: kworker/u18:0 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: hci0 hci_rx_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x436 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 check_memory_region_inline mm/kasan/generic.c:186 [inline]
 check_memory_region+0x13d/0x180 mm/kasan/generic.c:192
 memcpy+0x20/0x60 mm/kasan/common.c:105
 memcpy include/linux/string.h:406 [inline]
 bacpy include/net/bluetooth/bluetooth.h:274 [inline]
 hci_extended_inquiry_result_evt.isra.0+0x1be/0x5e0 net/bluetooth/hci_event.c:4394
 hci_event_packet+0x2828/0x86f5 net/bluetooth/hci_event.c:6115
 hci_rx_work+0x22e/0xb10 net/bluetooth/hci_core.c:4705
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Allocated by task 9908:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0xae/0x550 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1083 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:377 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:165 [inline]
 vhci_write+0xbd/0x450 drivers/bluetooth/hci_vhci.c:285
 call_write_iter include/linux/fs.h:1908 [inline]
 new_sync_write+0x422/0x650 fs/read_write.c:503
 vfs_write+0x59d/0x6b0 fs/read_write.c:578
 ksys_write+0x12d/0x250 fs/read_write.c:631
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 9723:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x103/0x2c0 mm/slab.c:3757
 skb_free_head net/core/skbuff.c:590 [inline]
 skb_release_data+0x6d9/0x910 net/core/skbuff.c:610
 skb_release_all net/core/skbuff.c:664 [inline]
 __kfree_skb net/core/skbuff.c:678 [inline]
 napi_consume_skb net/core/skbuff.c:913 [inline]
 napi_consume_skb+0x231/0x370 net/core/skbuff.c:894
 free_old_xmit_skbs+0xd5/0x230 drivers/net/virtio_net.c:1389
 virtnet_poll_tx+0x1e9/0x370 drivers/net/virtio_net.c:1516
 napi_poll net/core/dev.c:6684 [inline]
 net_rx_action+0x4a1/0xe60 net/core/dev.c:6752
 __do_softirq+0x34c/0xa60 kernel/softirq.c:292

The buggy address belongs to the object at ffff88801d217000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 4 bytes to the right of
 1024-byte region [ffff88801d217000, ffff88801d217400)
The buggy address belongs to the page:
page:ffffea00007485c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0000aa8948 ffffea00009e5388 ffff88802c800c40
raw: 0000000000000000 ffff88801d217000 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88801d217300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801d217380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801d217400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88801d217480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801d217500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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