linux-kernel - Re: [PATCH] firmware class: remove from pending list on load failure

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Message-ID: <CACVXFVPUF1x8YDwHtYzoC6LiPy22Lr2bZC-N73+NakFMBrEUFw@mail.gmail.com>
Date:	Wed, 7 Jan 2015 12:52:57 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] firmware class: remove from pending list on load failure

On Mon, Jan 5, 2015 at 11:41 PM, Sasha Levin <sasha.levin@...cle.com> wrote:
> If we failed loading the firmware we have to make sure it leaves the pending
> list if abort wasn't executed for it.
>
> Otherwise we'd free an object still on the pending list and corrupt it.
>
> Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
> ---
>  drivers/base/firmware_class.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
> index 58470c3..8ccf6cf4 100644
> --- a/drivers/base/firmware_class.c
> +++ b/drivers/base/firmware_class.c
> @@ -929,9 +929,18 @@ static int _request_firmware_load(struct firmware_priv *fw_priv,
>         cancel_delayed_work_sync(&fw_priv->timeout_work);
>         if (is_fw_load_aborted(buf))
>                 retval = -EAGAIN;
> -       else if (!buf->data)
> +       else if (!buf->data) {
>                 retval = -ENOMEM;
>
> +               /*
> +                * We failed loading, but abort was never done so we
> +                * need to remove it from the pending list ourselves.
> +                */
> +               mutex_lock(&fw_lock);
> +               list_del_init(&buf->pending_list);
> +               mutex_unlock(&fw_lock);

The buf is always removed before the complete_all(), isn't it? Or did
you observe the issue?

Thanks,
Ming Lei

> +       }
> +
>         device_remove_file(f_dev, &dev_attr_loading);
>  err_del_bin_attr:
>         device_remove_bin_file(f_dev, &firmware_attr_data);
> --
> 2.1.0
>
> --
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