Re: [PATCH v2] Bluetooth: skip invalid hci_sync_conn_complete_evt

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Desmond,

> Syzbot reported a corrupted list in kobject_add_internal [1]. This
> happens when multiple HCI_EV_SYNC_CONN_COMPLETE event packets with
> status 0 are sent for the same HCI connection. This causes us to
> register the device more than once which corrupts the kset list.
> 
> As this is forbidden behavior, we add a check for whether we're
> trying to process the same HCI_EV_SYNC_CONN_COMPLETE event multiple
> times for one connection. If that's the case, the event is invalid, so
> we report an error that the device is misbehaving, and ignore the
> packet.
> 
> Link: https://syzkaller.appspot.com/bug?extid=66264bf2fd0476be7e6c [1]
> Reported-by: syzbot+66264bf2fd0476be7e6c@xxxxxxxxxxxxxxxxxxxxxxxxx
> Tested-by: syzbot+66264bf2fd0476be7e6c@xxxxxxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Desmond Cheong Zhi Xi <desmondcheongzx@xxxxxxxxx>
> ---
> 
> v1 -> v2:
> - Added more comments to explain the reasoning behind the new check, and
> a bt_dev_err message upon detecting the invalid event. As suggested by
> Marcel Holtmann.
> 
> net/bluetooth/hci_event.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)

I shortened the error message and then applied your patch to bluetooth-next tree.

Regards

Marcel




[Index of Archives]     [Bluez Devel]     [Linux Wireless Networking]     [Linux Wireless Personal Area Networking]     [Linux ATH6KL]     [Linux USB Devel]     [Linux Media Drivers]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [Big List of Linux Books]

  Powered by Linux