Bluetooth: fix init and cleanup of sco_conn.timeout_work

[ Upstream commit 49d8a5606428ca0962d09050a5af81461ff90fbb ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 4a057f9..6e047e1 100644 (file)
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -133,6 +133,7 @@ static struct sco_conn *sco_conn_add(struct hci_conn *hcon)
                return NULL;
 
        spin_lock_init(&conn->lock);
+       INIT_DELAYED_WORK(&conn->timeout_work, sco_sock_timeout);
 
        hcon->sco_data = conn;
        conn->hcon = hcon;
@@ -197,11 +198,11 @@ static void sco_conn_del(struct hci_conn *hcon, int err)
                sco_chan_del(sk, err);
                release_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);
 }
@@ -214,8 +215,6 @@ static void __sco_chan_add(struct sco_conn *conn, struct sock *sk,
        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);
 }