Re: [PATCH] Bluetooth: Fix decrementing reference count twice in releasing socket

[Marcel Holtmann]

Hi Myungho,

> When releasing socket, it is possible to enter hci_sock_release() and
> hci_sock_dev_event(HCI_DEV_UNREG) at the same time in different thread.
> The reference count of hdev should be decremented only once from one of
> them but if storing hdev to local variable in hci_sock_release() before
> detached from socket and setting to NULL in hci_sock_dev_event(),
> hci_dev_put(hdev) is unexpectedly called twice. This is resolved by
> referencing hdev from socket after bt_sock_unlink() in
> hci_sock_release().
> 
> Reported-by: syzbot+fdc00003f4efff43bc5b@xxxxxxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Myungho Jung <mhjungk@xxxxxxxxx>
> ---
> net/bluetooth/hci_sock.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel