audit: type=1326 audit(1597696204.586:324): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=23834 comm="syz-executor.2" exe="/root/syz-executor.2" sig=9 arch=c000003e syscall=228 compat=0 ip=0x46007a code=0x0
==================================================================
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 ffff888088e314ff by task kworker/u5:0/1202

CPU: 0 PID: 1202 Comm: kworker/u5:0 Not tainted 4.14.193-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 23886:
 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 21314:
 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]
 kfree_skb+0xe7/0x390 net/core/skbuff.c:663
 unix_dgram_sendmsg+0x7e4/0x10a0 net/unix/af_unix.c:1842
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 SYSC_sendto net/socket.c:1763 [inline]
 SyS_sendto+0x1c7/0x2c0 net/socket.c:1731
 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 ffff888088e31300
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 511 bytes inside of
 512-byte region [ffff888088e31300, ffff888088e31500)
The buggy address belongs to the page:
page:ffffea0002238c40 count:1 mapcount:0 mapping:ffff888088e31080 index:0xffff888088e31080
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff888088e31080 ffff888088e31080 0000000100000005
raw: ffffea00025e3ee0 ffffea0002817c20 ffff88812fe52940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888088e31400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888088e31480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888088e31500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff888088e31580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888088e31600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================