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BUG: KASAN: slab-out-of-bounds in hci_extended_inquiry_result_evt net/bluetooth/hci_event.c:4357 [inline]
BUG: KASAN: slab-out-of-bounds in hci_event_packet+0x540e/0xaa9d net/bluetooth/hci_event.c:6075
Read of size 6 at addr ffff88809f875606 by task kworker/u5:0/1623

CPU: 0 PID: 1623 Comm: kworker/u5:0 Not tainted 5.7.0-rc5-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+0x188/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:382
 __kasan_report.cold+0x35/0x4d mm/kasan/report.c:511
 kasan_report+0x33/0x50 mm/kasan/common.c:625
 check_memory_region_inline mm/kasan/generic.c:187 [inline]
 check_memory_region+0x141/0x190 mm/kasan/generic.c:193
 memcpy+0x20/0x60 mm/kasan/common.c:106
 hci_extended_inquiry_result_evt net/bluetooth/hci_event.c:4357 [inline]
 hci_event_packet+0x540e/0xaa9d net/bluetooth/hci_event.c:6075
 hci_rx_work+0x239/0xb30 net/bluetooth/hci_core.c:4686
 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x388/0x470 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351

Allocated by task 22750:
 save_stack+0x1b/0x40 mm/kasan/common.c:49
 set_track mm/kasan/common.c:57 [inline]
 __kasan_kmalloc mm/kasan/common.c:495 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468
 __kmalloc_reserve.isra.0+0x39/0xe0 net/core/skbuff.c:142
 __alloc_skb+0xef/0x5a0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1083 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:358 [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:1907 [inline]
 new_sync_write+0x4a2/0x700 fs/read_write.c:484
 __vfs_write+0xc9/0x100 fs/read_write.c:497
 vfs_write+0x268/0x5d0 fs/read_write.c:559
 ksys_write+0x12d/0x250 fs/read_write.c:612
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

Freed by task 4119:
 save_stack+0x1b/0x40 mm/kasan/common.c:49
 set_track mm/kasan/common.c:57 [inline]
 kasan_set_free_info mm/kasan/common.c:317 [inline]
 __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:456
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x109/0x2b0 mm/slab.c:3757
 skb_free_head+0x8b/0xa0 net/core/skbuff.c:590
 skb_release_data+0x42e/0x8b0 net/core/skbuff.c:610
 skb_release_all+0x46/0x60 net/core/skbuff.c:664
 __kfree_skb net/core/skbuff.c:678 [inline]
 consume_skb net/core/skbuff.c:837 [inline]
 consume_skb+0xf3/0x400 net/core/skbuff.c:831
 skb_free_datagram+0x16/0xf0 net/core/datagram.c:325
 netlink_recvmsg+0x65e/0xee0 net/netlink/af_netlink.c:1997
 sock_recvmsg_nosec net/socket.c:886 [inline]
 sock_recvmsg net/socket.c:904 [inline]
 sock_recvmsg+0xca/0x110 net/socket.c:900
 ____sys_recvmsg+0x208/0x580 net/socket.c:2585
 ___sys_recvmsg+0xe4/0x150 net/socket.c:2627
 __sys_recvmsg+0xe9/0x1b0 net/socket.c:2661
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

The buggy address belongs to the object at ffff88809f875400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 6 bytes to the right of
 512-byte region [ffff88809f875400, ffff88809f875600)
The buggy address belongs to the page:
page:ffffea00027e1d40 refcount:1 mapcount:0 mapping:00000000f452e0e1 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea000287fb48 ffffea00029caf48 ffff8880aa000a80
raw: 0000000000000000 ffff88809f875000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809f875500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88809f875580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88809f875600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88809f875680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809f875700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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