linux-kernel - Re: [syzbot] Re: [PATCH v1] Bluetooth: hci_conn: Use disable_delayed_work

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Message-ID: <66fc29c4.050a0220.f28ec.04bc.GAE@google.com>
Date: Tue, 01 Oct 2024 09:56:36 -0700
From: syzbot <syzbot+2446dd3cb07277388db6@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] Re: [PATCH v1] Bluetooth: hci_conn: Use disable_delayed_work_sync

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***

Subject: Re: [PATCH v1] Bluetooth: hci_conn: Use disable_delayed_work_sync
Author: luiz.dentz@...il.com

On Tue, Oct 1, 2024 at 12:50 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.
>
> Reported-by: syzbot+2446dd3cb07277388db6@...kaller.appspotmail.com
> Closes: Reported-by: syzbot+2446dd3cb07277388db6@...kaller.appspotmail.com
> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
> ---
>  net/bluetooth/hci_conn.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
> index 0c01ece500a9..fb0946eac8a4 100644
> --- a/net/bluetooth/hci_conn.c
> +++ b/net/bluetooth/hci_conn.c
> @@ -1124,9 +1124,9 @@ void hci_conn_del(struct hci_conn *conn)
>
>         hci_conn_unlink(conn);
>
> -       cancel_delayed_work_sync(&conn->disc_work);
> -       cancel_delayed_work_sync(&conn->auto_accept_work);
> -       cancel_delayed_work_sync(&conn->idle_work);
> +       disable_delayed_work_sync(&conn->disc_work);
> +       disable_delayed_work_sync(&conn->auto_accept_work);
> +       disable_delayed_work_sync(&conn->idle_work);
>
>         if (conn->type == ACL_LINK) {
>                 /* Unacked frames */
> --
> 2.46.1
>

#syz test

-- 
Luiz Augusto von Dentz