Bluetooth: hci0: Entering manufacturer mode failed (-110)
Bluetooth: hci0: Frame reassembly failed (-84)
Bluetooth: hci0: Frame reassembly failed (-84)
Bluetooth: hci4: Entering manufacturer mode failed (-110)
==================================================================
BUG: KASAN: use-after-free in hci_cmd_timeout+0x1a2/0x1c0 net/bluetooth/hci_core.c:2525
Read of size 2 at addr ffff888084a70508 by task kworker/0:0/16773

CPU: 0 PID: 16773 Comm: kworker/0:0 Not tainted 4.14.175-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events hci_cmd_timeout
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xf7/0x13b lib/dump_stack.c:58
 print_address_description.cold.7+0x9/0x1c9 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report.cold.8+0x11a/0x2d3 mm/kasan/report.c:409
 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:440
Bluetooth: hci5: Entering manufacturer mode failed (-110)
 hci_cmd_timeout+0x1a2/0x1c0 net/bluetooth/hci_core.c:2525
 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2116
 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250
 kthread+0x338/0x400 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Allocated by task 7328:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:551
 __do_kmalloc_node mm/slab.c:3682 [inline]
 __kmalloc_node_track_caller+0x50/0x70 mm/slab.c:3696
 __kmalloc_reserve.isra.38+0x2c/0xc0 net/core/skbuff.c:137
 __alloc_skb+0xc1/0x500 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:980 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:336 [inline]
 hci_prepare_cmd+0x2c/0x200 net/bluetooth/hci_request.c:298
 hci_req_add_ev+0x7f/0x1f0 net/bluetooth/hci_request.c:332
 __hci_cmd_sync_ev+0x15d/0x5f0 net/bluetooth/hci_request.c:129
 __hci_cmd_sync+0x12/0x20 net/bluetooth/hci_request.c:185
 btintel_enter_mfg+0x71/0xd0 drivers/bluetooth/btintel.c:81
 ag6xx_setup+0x103/0x790 drivers/bluetooth/hci_ag6xx.c:180
 hci_uart_setup+0x19c/0x3a0 drivers/bluetooth/hci_ldisc.c:429
 hci_dev_do_open+0x8c4/0xe70 net/bluetooth/hci_core.c:1384
 hci_power_on+0x7d/0x360 net/bluetooth/hci_core.c:2080
 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2116
 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250
 kthread+0x338/0x400 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Freed by task 7328:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xcc/0x270 mm/slab.c:3815
 skb_free_head+0x74/0x90 net/core/skbuff.c:554
 skb_release_data+0x4d3/0x860 net/core/skbuff.c:574
 skb_release_all+0x3d/0x50 net/core/skbuff.c:631
 __kfree_skb net/core/skbuff.c:645 [inline]
 kfree_skb+0x8a/0x2b0 net/core/skbuff.c:663
 hci_dev_do_open+0x7e8/0xe70 net/bluetooth/hci_core.c:1469
 hci_power_on+0x7d/0x360 net/bluetooth/hci_core.c:2080
 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2116
 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250
 kthread+0x338/0x400 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

The buggy address belongs to the object at ffff888084a70500
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 8 bytes inside of
 512-byte region [ffff888084a70500, ffff888084a70700)
The buggy address belongs to the page:
page:ffffea0002129c00 count:1 mapcount:0 mapping:ffff888084a70000 index:0x0
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff888084a70000 0000000000000000 0000000100000006
raw: ffffea00024576e0 ffffea000297df60 ffff8880aa800940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888084a70400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888084a70480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888084a70500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff888084a70580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888084a70600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Bluetooth: hci5: Frame reassembly failed (-84)