netdev - Re: [PATCH] Bluetooth: fix kernel null pointer dereference error on suspend

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Date:   Mon, 29 Jun 2020 17:42:02 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Vamshi K Sthambamkadi <vamshi.k.sthambamkadi@...il.com>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-bluetooth <linux-bluetooth@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: fix kernel null pointer dereference error on
 suspend

Hi Vamshi,

> BUG Call Trace:
>  queue_work_on+0x39/0x40
>  hci_adv_monitors_clear+0x71/0x90 [bluetooth]
>  hci_unregister_dev+0x18a/0x2f0 [bluetooth]
>  btusb_disconnect+0x68/0x150 [btusb]
>  usb_unbind_interface+0x7f/0x260
>  device_release_driver_internal+0xec/0x1b0
>  device_release_driver+0x12/0x20
>  bus_remove_device+0xe1/0x150
>  device_del+0x17d/0x3e0
>  usb_disable_device+0x9f/0x250
>  usb_disconnect+0xc6/0x270
>  hub_event+0x6da/0x18d0
>  process_one_work+0x20c/0x400
>  worker_thread+0x34/0x400
> 
> RIP: 0010:__queue_work+0x92/0x3f0
> 
> NULL deference occurs in hci_update_background_scan() while it tries
> to queue_work on already destroyed workqueues.
> 
> Change hci_unregister_dev() to invoke destroy_workqueues after the
> call to hci_adv_monitors_clear().
> 
> Signed-off-by: Vamshi K Sthambamkadi <vamshi.k.sthambamkadi@...il.com>
> ---
> net/bluetooth/hci_core.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel