linux-kernel - Re: [syzbot] Re: [PATCH v3] Bluetooth: SCO: Use disable_delayed_work

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Message-ID: <66fd9ce9.050a0220.9ec68.002a.GAE@google.com>
Date: Wed, 02 Oct 2024 12:20:09 -0700
From: syzbot <syzbot+4c0d0c4cde787116d465@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] Re: [PATCH v3] Bluetooth: SCO: Use disable_delayed_work_sync

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***

Subject: Re: [PATCH v3] Bluetooth: SCO: Use disable_delayed_work_sync
Author: luiz.dentz@...il.com

#syz test

On Wed, Oct 2, 2024 at 3:04 PM Luiz Augusto von Dentz
<luiz.dentz@...il.com> wrote:
>
> From: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
>
> This makes use of disable_delayed_work_sync instead
> cancel_delayed_work_sync as it not only cancel the ongoing work but also
> disables new submit which is disarable since the object holding the work
> is about to be freed.
>
> In addition to it remove call to sco_sock_set_timer on __sco_sock_close
> since at that point it is useless to set a timer as the sk will be freed
> there is nothing to be done in sco_sock_timeout.
>
> Reported-by: syzbot+4c0d0c4cde787116d465@...kaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=4c0d0c4cde787116d465
> Fixes: ba316be1b6a0 ("Bluetooth: schedule SCO timeouts with delayed_work")
> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
> ---
>  net/bluetooth/sco.c | 13 +------------
>  1 file changed, 1 insertion(+), 12 deletions(-)
>
> diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
> index a5ac160c592e..2b1e66976068 100644
> --- a/net/bluetooth/sco.c
> +++ b/net/bluetooth/sco.c
> @@ -208,7 +208,7 @@ static void sco_conn_del(struct hci_conn *hcon, int err)
>         }
>
>         /* Ensure no more work items will run before freeing conn. */
> -       cancel_delayed_work_sync(&conn->timeout_work);
> +       disable_delayed_work_sync(&conn->timeout_work);
>
>         hcon->sco_data = NULL;
>         kfree(conn);
> @@ -442,17 +442,6 @@ static void __sco_sock_close(struct sock *sk)
>
>         case BT_CONNECTED:
>         case BT_CONFIG:
> -               if (sco_pi(sk)->conn->hcon) {
> -                       sk->sk_state = BT_DISCONN;
> -                       sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT);
> -                       sco_conn_lock(sco_pi(sk)->conn);
> -                       hci_conn_drop(sco_pi(sk)->conn->hcon);
> -                       sco_pi(sk)->conn->hcon = NULL;
> -                       sco_conn_unlock(sco_pi(sk)->conn);
> -               } else
> -                       sco_chan_del(sk, ECONNRESET);
> -               break;
> -
>         case BT_CONNECT2:
>         case BT_CONNECT:
>         case BT_DISCONN:
> --
> 2.46.1
>


-- 
Luiz Augusto von Dentz