netdev - [PATCH 2/2] Bluetooth: fix init and cleanup of sco_conn.timeout

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Message-Id: <20210903031306.78292-3-desmondcheongzx@gmail.com>
Date:   Thu,  2 Sep 2021 23:13:06 -0400
From:   Desmond Cheong Zhi Xi <desmondcheongzx@...il.com>
To:     marcel@...tmann.org, johan.hedberg@...il.com, luiz.dentz@...il.com,
        davem@...emloft.net, kuba@...nel.org
Cc:     Desmond Cheong Zhi Xi <desmondcheongzx@...il.com>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, eric.dumazet@...il.com
Subject: [PATCH 2/2] Bluetooth: fix init and cleanup of sco_conn.timeout_work

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@...il.com>
---
 net/bluetooth/sco.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 4a057f99b60a..6e047e178c0a 100644
--- 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);
 }
-- 
2.25.1