linux-kernel - Re: [PATCH] p54: Fix an error handling path in p54spi

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Date:   Sun, 12 Jun 2022 22:45:20 +0200
From:   Christian Lamparter <chunkeey@...il.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "John W. Linville" <linville@...driver.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Christian Lamparter <chunkeey@....de>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] p54: Fix an error handling path in p54spi_probe()

Hi,

On Sun, Jun 12, 2022 at 9:55 PM Christophe JAILLET
<christophe.jaillet@...adoo.fr> wrote:
>
> If an error occurs after a successful call to p54spi_request_firmware(), it
> must be undone by a corresponding release_firmware()

Yes, good catch. That makes sense.

> as already done in the error handling path of p54spi_request_firmware() and in
> the .remove() function.
>
> Add the missing call in the error handling path and update some goto
> label accordingly.

>From what I know, "release_firmware(some *fw)" includes a check for
*fw != NULL already.

we could just add a single release_firmware(priv->firmware) to any of the error
paths labels (i.e.: err_free_common) and then we remove the extra
release_firmware(...) in p54spi_request_firmware so that we don't try to free
it twice.

(This also skips the need for having "err_release_firmaware" .. which
unfortunately has a small typo)

Regards,
Christian

> Fixes: cd8d3d321285 ("p54spi: p54spi driver")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>  drivers/net/wireless/intersil/p54/p54spi.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/wireless/intersil/p54/p54spi.c b/drivers/net/wireless/intersil/p54/p54spi.c
> index f99b7ba69fc3..679ac164c994 100644
> --- a/drivers/net/wireless/intersil/p54/p54spi.c
> +++ b/drivers/net/wireless/intersil/p54/p54spi.c
> @@ -650,14 +650,16 @@ static int p54spi_probe(struct spi_device *spi)
>
>         ret = p54spi_request_eeprom(hw);
>         if (ret)
> -               goto err_free_common;
> +               goto err_release_firmaware;
>
>         ret = p54_register_common(hw, &priv->spi->dev);
>         if (ret)
> -               goto err_free_common;
> +               goto err_release_firmaware;
>
>         return 0;
>
> +err_release_firmaware:
> +       release_firmware(priv->firmware);
>  err_free_common:
>         free_irq(gpio_to_irq(p54spi_gpio_irq), spi);
>  err_free_gpio_irq:
> --
> 2.34.1
>