Re: bluetooth: use-after-free in vhci_send_frame

From: Dmitry Vyukov
Date: Thu Mar 10 2016 - 11:25:50 EST

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In reply to: Marcel Holtmann: "Re: bluetooth: use-after-free in vhci_send_frame"
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On Tue, Mar 8, 2016 at 7:32 PM, Marcel Holtmann <marcel@xxxxxxxxxxxx> wrote:
> Hi Dmitry,
>
>>>>>> I've got the following use-after-free reports while running syzkaller
>>>>>> fuzzer. Unfortunately no reproducer. But this happened when system was
>>>>>> busy reacting on sysrq t, so probably some unexpected delay happended.
>>>>>>
>>>>>> On commit 92e963f50fc74041b5e9e744c330dca48e04f08d.
>>>>>>
>>>>>> ==================================================================
>>>>>> BUG: KASAN: use-after-free in do_raw_spin_unlock+0x228/0x240 at addr
>>>>>> ffff88003a8a9ed8
>>>>>> Write of size 8 by task kworker/u12:2/10322
>>>>>> =============================================================================
>>>>>> BUG kmalloc-512 (Tainted: G B ): kasan: bad access detected
>>>>>> -----------------------------------------------------------------------------
>>>>>>
>>>>>> INFO: Allocated in vhci_open+0x50/0x350 age=6743 cpu=0 pid=10397
>>>>>> [< none >] ___slab_alloc+0x564/0x5b0 mm/slub.c:2470
>>>>>> [< none >] __slab_alloc+0x66/0xc0 mm/slub.c:2499
>>>>>> [< inline >] slab_alloc_node mm/slub.c:2562
>>>>>> [< inline >] slab_alloc mm/slub.c:2604
>>>>>> [< none >] kmem_cache_alloc_trace+0x25c/0x300 mm/slub.c:2621
>>>>>> [< inline >] kmalloc include/linux/slab.h:463
>>>>>> [< inline >] kzalloc include/linux/slab.h:607
>>>>>> [< none >] vhci_open+0x50/0x350 drivers/bluetooth/hci_vhci.c:316
>>>>>> [< none >] misc_open+0x388/0x520 drivers/char/misc.c:153
>>>>>> [< none >] chrdev_open+0x22a/0x4c0 fs/char_dev.c:388
>>>>>> [< none >] do_dentry_open+0x6a2/0xcb0 fs/open.c:736
>>>>>> [< none >] vfs_open+0x17b/0x1f0 fs/open.c:853
>>>>>> [< inline >] do_last fs/namei.c:3254
>>>>>> [< none >] path_openat+0xde9/0x5e30 fs/namei.c:3386
>>>>>> [< none >] do_filp_open+0x18e/0x250 fs/namei.c:3421
>>>>>> [< none >] do_sys_open+0x1fc/0x420 fs/open.c:1022
>>>>>> [< inline >] SYSC_open fs/open.c:1040
>>>>>> [< none >] SyS_open+0x2d/0x40 fs/open.c:1035
>>>>>> [< none >] entry_SYSCALL_64_fastpath+0x16/0x7a
>>>>>> arch/x86/entry/entry_64.S:185
>>>>>>
>>>>>> INFO: Freed in vhci_release+0xae/0xe0 age=2072 cpu=2 pid=10397
>>>>>> [< none >] __slab_free+0x1fc/0x320 mm/slub.c:2680
>>>>>> [< inline >] slab_free mm/slub.c:2835
>>>>>> [< none >] kfree+0x2ac/0x2c0 mm/slub.c:3664
>>>>>> [< none >] vhci_release+0xae/0xe0 drivers/bluetooth/hci_vhci.c:346
>>>>>> [< none >] __fput+0x236/0x780 fs/file_table.c:208
>>>>>> [< none >] ____fput+0x15/0x20 fs/file_table.c:244
>>>>>> [< none >] task_work_run+0x170/0x210 kernel/task_work.c:115
>>>>>> [< inline >] exit_task_work include/linux/task_work.h:21
>>>>>> [< none >] do_exit+0x8b5/0x2cb0 kernel/exit.c:748
>>>>>> [< none >] do_group_exit+0x108/0x330 kernel/exit.c:878
>>>>>> [< none >] get_signal+0x5e4/0x14f0 kernel/signal.c:2307
>>>>>> [< none >] do_signal+0x83/0x1c90 arch/x86/kernel/signal.c:712
>>>>>> [< none >] exit_to_usermode_loop+0x1a5/0x210
>>>>>> arch/x86/entry/common.c:247
>>>>>> [< inline >] prepare_exit_to_usermode arch/x86/entry/common.c:282
>>>>>> [< none >] syscall_return_slowpath+0x2ba/0x340
>>>>>> arch/x86/entry/common.c:344
>>>>>> [< none >] int_ret_from_sys_call+0x25/0x9f
>>>>>> arch/x86/entry/entry_64.S:281
>>>>>>
>>>>>> INFO: Slab 0xffffea0000ea2a00 objects=16 used=14 fp=0xffff88003a8a9ec0
>>>>>> flags=0x1fffc0000004080
>>>>>> INFO: Object 0xffff88003a8a9ec0 @offset=7872 fp=0xffff88003a8a9ae8
>>>>>> CPU: 1 PID: 10322 Comm: kworker/u12:2 Tainted: G B 4.5.0-rc1+ #300
>>>>>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
>>>>>> Workqueue: hci0 hci_cmd_work
>>>>>> 00000000ffffffff ffff88003634f9f8 ffffffff82be118d ffff88003e804f00
>>>>>> ffff88003a8a9ec0 ffff88003a8a8000 ffff88003634fa28 ffffffff8175b434
>>>>>> ffff88003e804f00 ffffea0000ea2a00 ffff88003a8a9ec0 0000000000000001
>>>>>>
>>>>>> Call Trace:
>>>>>> [< inline >] kasan_report mm/kasan/report.c:274
>>>>>> [<ffffffff81764f9e>] __asan_report_store8_noabort+0x3e/0x40
>>>>>> mm/kasan/report.c:300
>>>>>> [< inline >] debug_spin_unlock kernel/locking/spinlock_debug.c:102
>>>>>> [<ffffffff81466608>] do_raw_spin_unlock+0x228/0x240
>>>>>> kernel/locking/spinlock_debug.c:158
>>>>>> [< inline >] __raw_spin_unlock_irqrestore
>>>>>> include/linux/spinlock_api_smp.h:161
>>>>>> [<ffffffff86652cf7>] _raw_spin_unlock_irqrestore+0x27/0xc0
>>>>>> kernel/locking/spinlock.c:191
>>>>>> [< inline >] spin_unlock_irqrestore include/linux/spinlock.h:362
>>>>>> [<ffffffff8143975f>] __wake_up+0x3f/0x50 kernel/sched/wait.c:96
>>>>>> [<ffffffff8484b983>] vhci_send_frame+0xc3/0x100 drivers/bluetooth/hci_vhci.c:86
>>>>>> [<ffffffff85d38315>] hci_send_frame+0x1f5/0x310 net/bluetooth/hci_core.c:3316
>>>>>> [<ffffffff85d385bf>] hci_cmd_work+0x18f/0x2e0 net/bluetooth/hci_core.c:4196
>>>>>> [<ffffffff813a2386>] process_one_work+0x796/0x1440 kernel/workqueue.c:2037
>>>>>> [<ffffffff813a310b>] worker_thread+0xdb/0xfc0 kernel/workqueue.c:2171
>>>>>> [<ffffffff813b637f>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303
>>>>>> [<ffffffff866535ef>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468
>>>>>> ==================================================================
>>>>>>
>>>>>> ==================================================================
>>>>>> BUG: KASAN: use-after-free in do_raw_spin_lock+0x281/0x2b0 at addr
>>>>>> ffff88003a8a9f2c
>>>>>> Read of size 4 by task kworker/u12:0/3554
>>>>>> =============================================================================
>>>>>> BUG kmalloc-512 (Tainted: G B ): kasan: bad access detected
>>>>>> -----------------------------------------------------------------------------
>>>>>>
>>>>>> INFO: Allocated in vhci_open+0x50/0x350 age=16305 cpu=0 pid=10397
>>>>>> [< none >] ___slab_alloc+0x564/0x5b0 mm/slub.c:2470
>>>>>> [< none >] __slab_alloc+0x66/0xc0 mm/slub.c:2499
>>>>>> [< inline >] slab_alloc_node mm/slub.c:2562
>>>>>> [< inline >] slab_alloc mm/slub.c:2604
>>>>>> [< none >] kmem_cache_alloc_trace+0x25c/0x300 mm/slub.c:2621
>>>>>> [< inline >] kmalloc include/linux/slab.h:463
>>>>>> [< inline >] kzalloc include/linux/slab.h:607
>>>>>> [< none >] vhci_open+0x50/0x350 drivers/bluetooth/hci_vhci.c:316
>>>>>> [< none >] misc_open+0x388/0x520 drivers/char/misc.c:153
>>>>>> [< none >] chrdev_open+0x22a/0x4c0 fs/char_dev.c:388
>>>>>> [< none >] do_dentry_open+0x6a2/0xcb0 fs/open.c:736
>>>>>> [< none >] vfs_open+0x17b/0x1f0 fs/open.c:853
>>>>>> [< inline >] do_last fs/namei.c:3254
>>>>>> [< none >] path_openat+0xde9/0x5e30 fs/namei.c:3386
>>>>>> [< none >] do_filp_open+0x18e/0x250 fs/namei.c:3421
>>>>>> [< none >] do_sys_open+0x1fc/0x420 fs/open.c:1022
>>>>>> [< inline >] SYSC_open fs/open.c:1040
>>>>>> [< none >] SyS_open+0x2d/0x40 fs/open.c:1035
>>>>>> [< none >] entry_SYSCALL_64_fastpath+0x16/0x7a
>>>>>> arch/x86/entry/entry_64.S:185
>>>>>>
>>>>>> INFO: Freed in vhci_release+0xae/0xe0 age=11634 cpu=2 pid=10397
>>>>>> [< none >] __slab_free+0x1fc/0x320 mm/slub.c:2680
>>>>>> [< inline >] slab_free mm/slub.c:2835
>>>>>> [< none >] kfree+0x2ac/0x2c0 mm/slub.c:3664
>>>>>> [< none >] vhci_release+0xae/0xe0 drivers/bluetooth/hci_vhci.c:346
>>>>>> [< none >] __fput+0x236/0x780 fs/file_table.c:208
>>>>>> [< none >] ____fput+0x15/0x20 fs/file_table.c:244
>>>>>> [< none >] task_work_run+0x170/0x210 kernel/task_work.c:115
>>>>>> [< inline >] exit_task_work include/linux/task_work.h:21
>>>>>> [< none >] do_exit+0x8b5/0x2cb0 kernel/exit.c:748
>>>>>> [< none >] do_group_exit+0x108/0x330 kernel/exit.c:878
>>>>>> [< none >] get_signal+0x5e4/0x14f0 kernel/signal.c:2307
>>>>>> [< none >] do_signal+0x83/0x1c90 arch/x86/kernel/signal.c:712
>>>>>> [< none >] exit_to_usermode_loop+0x1a5/0x210
>>>>>> arch/x86/entry/common.c:247
>>>>>> [< inline >] prepare_exit_to_usermode arch/x86/entry/common.c:282
>>>>>> [< none >] syscall_return_slowpath+0x2ba/0x340
>>>>>> arch/x86/entry/common.c:344
>>>>>> [< none >] int_ret_from_sys_call+0x25/0x9f
>>>>>> arch/x86/entry/entry_64.S:281
>>>>>>
>>>>>> INFO: Slab 0xffffea0000ea2a00 objects=16 used=12 fp=0xffff88003a8aaa48
>>>>>> flags=0x1fffc0000004080
>>>>>> INFO: Object 0xffff88003a8a9ec0 @offset=7872 fp=0xffff88003a8a9338
>>>>>> CPU: 0 PID: 3554 Comm: kworker/u12:0 Tainted: G B 4.5.0-rc1+ #300
>>>>>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
>>>>>> Workqueue: hci0 hci_power_on
>>>>>> 00000000ffffffff ffff880036abf838 ffffffff82be118d ffff88003e804f00
>>>>>> ffff88003a8a9ec0 ffff88003a8a8000 ffff880036abf868 ffffffff8175b434
>>>>>> ffff88003e804f00 ffffea0000ea2a00 ffff88003a8a9ec0 ffff880036abfb30
>>>>>>
>>>>>> Call Trace:
>>>>>> [< inline >] kasan_report mm/kasan/report.c:274
>>>>>> [<ffffffff81764e1e>] __asan_report_load4_noabort+0x3e/0x40
>>>>>> mm/kasan/report.c:294
>>>>>> [< inline >] debug_spin_lock_before kernel/locking/spinlock_debug.c:83
>>>>>> [<ffffffff814662e1>] do_raw_spin_lock+0x281/0x2b0
>>>>>> kernel/locking/spinlock_debug.c:135
>>>>>> [< inline >] __raw_spin_lock_irqsave
>>>>>> include/linux/spinlock_api_smp.h:119
>>>>>> [<ffffffff86652bd7>] _raw_spin_lock_irqsave+0xa7/0xd0
>>>>>> kernel/locking/spinlock.c:159
>>>>>> [<ffffffff854da1b2>] skb_dequeue+0x22/0x180 net/core/skbuff.c:2333
>>>>>> [<ffffffff854de656>] skb_queue_purge+0x26/0x40 net/core/skbuff.c:2371
>>>>>> [<ffffffff8484b9fb>] vhci_flush+0x3b/0x50 drivers/bluetooth/hci_vhci.c:74
>>>>>> [<ffffffff85d3a02f>] hci_dev_do_open+0x62f/0xf60 net/bluetooth/hci_core.c:1417
>>>>>> [<ffffffff85d42b98>] hci_power_on+0x108/0x4b0 net/bluetooth/hci_core.c:2027
>>>>>> [<ffffffff813a2386>] process_one_work+0x796/0x1440 kernel/workqueue.c:2037
>>>>>> [<ffffffff813a310b>] worker_thread+0xdb/0xfc0 kernel/workqueue.c:2171
>>>>>> [<ffffffff813b637f>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303
>>>>>> [<ffffffff866535ef>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468
>>>>>> ==================================================================
>>>>>> ==================================================================
>>>>>> BUG: KASAN: use-after-free in skb_dequeue+0x153/0x180 at addr ffff88003a8a9f10
>>>>>> Read of size 8 by task kworker/u12:0/3554
>>>>>> =============================================================================
>>>>>> BUG kmalloc-512 (Tainted: G B ): kasan: bad access detected
>>>>>> -----------------------------------------------------------------------------
>>>>>>
>>>>>> INFO: Allocated in vhci_open+0x50/0x350 age=16913 cpu=0 pid=10397
>>>>>> [< inline >] slab_alloc_node mm/slub.c:2562
>>>>>> [< inline >] slab_alloc mm/slub.c:2604
>>>>>> [< none >] kmem_cache_alloc_trace+0x25c/0x300 mm/slub.c:2621
>>>>>> [< inline >] kmalloc include/linux/slab.h:463
>>>>>> [< inline >] kzalloc include/linux/slab.h:607
>>>>>> [< none >] vhci_open+0x50/0x350 drivers/bluetooth/hci_vhci.c:316
>>>>>> [< none >] misc_open+0x388/0x520 drivers/char/misc.c:153
>>>>>> [< none >] chrdev_open+0x22a/0x4c0 fs/char_dev.c:388
>>>>>> [< none >] do_dentry_open+0x6a2/0xcb0 fs/open.c:736
>>>>>> [< none >] vfs_open+0x17b/0x1f0 fs/open.c:853
>>>>>> [< inline >] do_last fs/namei.c:3254
>>>>>> [< none >] path_openat+0xde9/0x5e30 fs/namei.c:3386
>>>>>> [< none >] do_filp_open+0x18e/0x250 fs/namei.c:3421
>>>>>> [< none >] do_sys_open+0x1fc/0x420 fs/open.c:1022
>>>>>> [< inline >] SYSC_open fs/open.c:1040
>>>>>> [< none >] SyS_open+0x2d/0x40 fs/open.c:1035
>>>>>> [< none >] entry_SYSCALL_64_fastpath+0x16/0x7a
>>>>>> arch/x86/entry/entry_64.S:185
>>>>>>
>>>>>> INFO: Freed in vhci_release+0xae/0xe0 age=12241 cpu=2 pid=10397
>>>>>> [< inline >] slab_free mm/slub.c:2835
>>>>>> [< none >] kfree+0x2ac/0x2c0 mm/slub.c:3664
>>>>>> [< none >] vhci_release+0xae/0xe0 drivers/bluetooth/hci_vhci.c:346
>>>>>> [< none >] __fput+0x236/0x780 fs/file_table.c:208
>>>>>> [< none >] ____fput+0x15/0x20 fs/file_table.c:244
>>>>>> [< none >] task_work_run+0x170/0x210 kernel/task_work.c:115
>>>>>> [< inline >] exit_task_work include/linux/task_work.h:21
>>>>>> [< none >] do_exit+0x8b5/0x2cb0 kernel/exit.c:748
>>>>>> [< none >] do_group_exit+0x108/0x330 kernel/exit.c:878
>>>>>> [< none >] get_signal+0x5e4/0x14f0 kernel/signal.c:2307
>>>>>> [< none >] do_signal+0x83/0x1c90 arch/x86/kernel/signal.c:712
>>>>>> [< none >] exit_to_usermode_loop+0x1a5/0x210
>>>>>> arch/x86/entry/common.c:247
>>>>>> [< inline >] prepare_exit_to_usermode arch/x86/entry/common.c:282
>>>>>> [< none >] syscall_return_slowpath+0x2ba/0x340
>>>>>> arch/x86/entry/common.c:344
>>>>>> [< none >] int_ret_from_sys_call+0x25/0x9f
>>>>>> arch/x86/entry/entry_64.S:281
>>>>>>
>>>>>> INFO: Slab 0xffffea0000ea2a00 objects=16 used=12 fp=0xffff88003a8aaa48
>>>>>> flags=0x1fffc0000004080
>>>>>> INFO: Object 0xffff88003a8a9ec0 @offset=7872 fp=0xffff88003a8a9338
>>>>>> CPU: 0 PID: 3554 Comm: kworker/u12:0 Tainted: G B 4.5.0-rc1+ #300
>>>>>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
>>>>>> Workqueue: hci0 hci_power_on
>>>>>> 00000000ffffffff ffff880036abf898 ffffffff82be118d ffff88003e804f00
>>>>>> ffff88003a8a9ec0 ffff88003a8a8000 ffff880036abf8c8 ffffffff8175b434
>>>>>> ffff88003e804f00 ffffea0000ea2a00 ffff88003a8a9ec0 0000000000000282
>>>>>>
>>>>>> Call Trace:
>>>>>> [< inline >] kasan_report mm/kasan/report.c:274
>>>>>> [<ffffffff81764e5e>] __asan_report_load8_noabort+0x3e/0x40
>>>>>> mm/kasan/report.c:295
>>>>>> [< inline >] skb_peek include/linux/skbuff.h:1453
>>>>>> [< inline >] __skb_dequeue include/linux/skbuff.h:1735
>>>>>> [<ffffffff854da2e3>] skb_dequeue+0x153/0x180 net/core/skbuff.c:2334
>>>>>> [<ffffffff854de656>] skb_queue_purge+0x26/0x40 net/core/skbuff.c:2371
>>>>>> [<ffffffff8484b9fb>] vhci_flush+0x3b/0x50 drivers/bluetooth/hci_vhci.c:74
>>>>>> [<ffffffff85d3a02f>] hci_dev_do_open+0x62f/0xf60 net/bluetooth/hci_core.c:1417
>>>>>> [<ffffffff85d42b98>] hci_power_on+0x108/0x4b0 net/bluetooth/hci_core.c:2027
>>>>>> [<ffffffff813a2386>] process_one_work+0x796/0x1440 kernel/workqueue.c:2037
>>>>>> [<ffffffff813a310b>] worker_thread+0xdb/0xfc0 kernel/workqueue.c:2171
>>>>>> [<ffffffff813b637f>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303
>>>>>> [<ffffffff866535ef>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468
>>>>>> ==================================================================
>>>>>
>>>>>
>>>>>
>>>>> Ping.
>>>>> Just got another one on 4.5-rc6
>>>>
>>>> FWIW I've just hit that too right now.
>>>>
>>>> But I haven't hit it with 4.4 which I am fuzzing by the orders of
>>>> magnitude longer. But take it with grain of salt -- it could be a
>>>> coincidence, of course.
>>>
>>> do you know what the fuzzer was doing at this point. Is the fuzzer opening /dev/vhci device node? Since that would be the only way to actually get into that driver.
>>
>> Check out the KASAN reports. They should answer your question.
>
> that means very little to me actually. So is the real issue caused by opening /dev/vhci or is that theoretical one via some internal kernel compile time feature.

This is a real use-after-free bug that actually happened on my machine.

The memory was allocated inside of SyS_open syscall which called
vhci_open. So, yes, actual opening of /dev/vhci was definitely
involved:

INFO: Allocated in vhci_open+0x50/0x350 age=6743 cpu=0 pid=10397
[< none >] ___slab_alloc+0x564/0x5b0 mm/slub.c:2470
[< none >] __slab_alloc+0x66/0xc0 mm/slub.c:2499
[< inline >] slab_alloc_node mm/slub.c:2562
[< inline >] slab_alloc mm/slub.c:2604
[< none >] kmem_cache_alloc_trace+0x25c/0x300 mm/slub.c:2621
[< inline >] kmalloc include/linux/slab.h:463
[< inline >] kzalloc include/linux/slab.h:607
[< none >] vhci_open+0x50/0x350 drivers/bluetooth/hci_vhci.c:316
[< none >] misc_open+0x388/0x520 drivers/char/misc.c:153
[< none >] chrdev_open+0x22a/0x4c0 fs/char_dev.c:388
[< none >] do_dentry_open+0x6a2/0xcb0 fs/open.c:736
[< none >] vfs_open+0x17b/0x1f0 fs/open.c:853
[< inline >] do_last fs/namei.c:3254
[< none >] path_openat+0xde9/0x5e30 fs/namei.c:3386
[< none >] do_filp_open+0x18e/0x250 fs/namei.c:3421
[< none >] do_sys_open+0x1fc/0x420 fs/open.c:1022
[< inline >] SYSC_open fs/open.c:1040
[< none >] SyS_open+0x2d/0x40 fs/open.c:1035
[< none >] entry_SYSCALL_64_fastpath+0x16/0x7a

Then memory was freed here (by the same task):

INFO: Freed in vhci_release+0xae/0xe0 age=11634 cpu=2 pid=10397
[< none >] __slab_free+0x1fc/0x320 mm/slub.c:2680
[< inline >] slab_free mm/slub.c:2835
[< none >] kfree+0x2ac/0x2c0 mm/slub.c:3664
[< none >] vhci_release+0xae/0xe0 drivers/bluetooth/hci_vhci.c:346
[< none >] __fput+0x236/0x780 fs/file_table.c:208
[< none >] ____fput+0x15/0x20 fs/file_table.c:244
[< none >] task_work_run+0x170/0x210 kernel/task_work.c:115
[< inline >] exit_task_work include/linux/task_work.h:21
[< none >] do_exit+0x8b5/0x2cb0 kernel/exit.c:748
[< none >] do_group_exit+0x108/0x330 kernel/exit.c:878
[< none >] get_signal+0x5e4/0x14f0 kernel/signal.c:2307
[< none >] do_signal+0x83/0x1c90 arch/x86/kernel/signal.c:712
[< none >] exit_to_usermode_loop+0x1a5/0x210
arch/x86/entry/common.c:247
[< inline >] prepare_exit_to_usermode arch/x86/entry/common.c:282
[< none >] syscall_return_slowpath+0x2ba/0x340
arch/x86/entry/common.c:344
[< none >] int_ret_from_sys_call+0x25/0x9f
arch/x86/entry/entry_64.S:281

And then a worker thread accessed it here:

Call Trace:
[< inline >] kasan_report mm/kasan/report.c:274
[<ffffffff81764f9e>] __asan_report_store8_noabort+0x3e/0x40
mm/kasan/report.c:300
[< inline >] debug_spin_unlock kernel/locking/spinlock_debug.c:102
[<ffffffff81466608>] do_raw_spin_unlock+0x228/0x240
kernel/locking/spinlock_debug.c:158
[< inline >] __raw_spin_unlock_irqrestore
include/linux/spinlock_api_smp.h:161
[<ffffffff86652cf7>] _raw_spin_unlock_irqrestore+0x27/0xc0
kernel/locking/spinlock.c:191
[< inline >] spin_unlock_irqrestore include/linux/spinlock.h:362
[<ffffffff8143975f>] __wake_up+0x3f/0x50 kernel/sched/wait.c:96
[<ffffffff8484b983>] vhci_send_frame+0xc3/0x100 drivers/bluetooth/hci_vhci.c:86
[<ffffffff85d38315>] hci_send_frame+0x1f5/0x310 net/bluetooth/hci_core.c:3316
[<ffffffff85d385bf>] hci_cmd_work+0x18f/0x2e0 net/bluetooth/hci_core.c:4196
[<ffffffff813a2386>] process_one_work+0x796/0x1440 kernel/workqueue.c:2037
[<ffffffff813a310b>] worker_thread+0xdb/0xfc0 kernel/workqueue.c:2171
[<ffffffff813b637f>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303
[<ffffffff866535ef>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468

So either freeing of the memory must be delayed, or the access must not happen.

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