From: Desmond Cheong Zhi Xi desmondcheongzx@gmail.com
commit 49d8a5606428ca0962d09050a5af81461ff90fbb upstream.
Before freeing struct sco_conn, all delayed timeout work should be cancelled. Otherwise, sco_sock_timeout could potentially use the sco_conn after it has been freed.
Additionally, sco_conn.timeout_work should be initialized when the connection is allocated, not when the channel is added. This is because an sco_conn can create channels with multiple sockets over its lifetime, which happens if sockets are released but the connection isn't deleted.
Fixes: ba316be1b6a0 ("Bluetooth: schedule SCO timeouts with delayed_work") Signed-off-by: Desmond Cheong Zhi Xi desmondcheongzx@gmail.com Signed-off-by: Luiz Augusto von Dentz luiz.von.dentz@intel.com [OP: adjusted context for 4.14] Signed-off-by: Ovidiu Panait ovidiu.panait@windriver.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/bluetooth/sco.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-)
--- a/net/bluetooth/sco.c +++ b/net/bluetooth/sco.c @@ -133,6 +133,7 @@ static struct sco_conn *sco_conn_add(str return NULL;
spin_lock_init(&conn->lock); + INIT_DELAYED_WORK(&conn->timeout_work, sco_sock_timeout);
hcon->sco_data = conn; conn->hcon = hcon; @@ -196,11 +197,11 @@ static void sco_conn_del(struct hci_conn sco_chan_del(sk, err); bh_unlock_sock(sk); sock_put(sk); - - /* Ensure no more work items will run before freeing conn. */ - cancel_delayed_work_sync(&conn->timeout_work); }
+ /* Ensure no more work items will run before freeing conn. */ + cancel_delayed_work_sync(&conn->timeout_work); + hcon->sco_data = NULL; kfree(conn); } @@ -213,8 +214,6 @@ static void __sco_chan_add(struct sco_co sco_pi(sk)->conn = conn; conn->sk = sk;
- INIT_DELAYED_WORK(&conn->timeout_work, sco_sock_timeout); - if (parent) bt_accept_enqueue(parent, sk, true); }