linux-kernel - Re: [PATCH 3/3] serial: liteuart: fix minor-number leak on probe errors

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Message-ID: <YZLOF2g8DBllJg2l@antec>
Date:   Tue, 16 Nov 2021 06:16:07 +0900
From:   Stafford Horne <shorne@...il.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ilia Sergachev <silia@...z.ch>,
        Karol Gugala <kgugala@...micro.com>,
        Mateusz Holenko <mholenko@...micro.com>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Filip Kokosinski <fkokosinski@...micro.com>
Subject: Re: [PATCH 3/3] serial: liteuart: fix minor-number leak on probe
 errors

On Mon, Nov 15, 2021 at 02:37:45PM +0100, Johan Hovold wrote:
> Make sure to release the allocated minor number before returning on
> probe errors.
> 
> Fixes: 1da81e5562fa ("drivers/tty/serial: add LiteUART driver")
> Cc: stable@...r.kernel.org      # 5.11
> Cc: Filip Kokosinski <fkokosinski@...micro.com>
> Cc: Mateusz Holenko <mholenko@...micro.com>
> Cc: Stafford Horne <shorne@...il.com>
> Signed-off-by: Johan Hovold <johan@...nel.org>

Reviewed-by: Stafford Horne <shorne@...il.com>

> ---
>  drivers/tty/serial/liteuart.c | 17 ++++++++++++++---
>  1 file changed, 14 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/tty/serial/liteuart.c b/drivers/tty/serial/liteuart.c
> index da792d0df790..2941659e5274 100644
> --- a/drivers/tty/serial/liteuart.c
> +++ b/drivers/tty/serial/liteuart.c
> @@ -270,8 +270,10 @@ static int liteuart_probe(struct platform_device *pdev)
>  
>  	/* get membase */
>  	port->membase = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
> -	if (IS_ERR(port->membase))
> -		return PTR_ERR(port->membase);
> +	if (IS_ERR(port->membase)) {
> +		ret = PTR_ERR(port->membase);
> +		goto err_erase_id;
> +	}
>  
>  	/* values not from device tree */
>  	port->dev = &pdev->dev;
> @@ -287,7 +289,16 @@ static int liteuart_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, port);
>  
> -	return uart_add_one_port(&liteuart_driver, &uart->port);
> +	ret = uart_add_one_port(&liteuart_driver, &uart->port);
> +	if (ret)
> +		goto err_erase_id;
> +
> +	return 0;
> +
> +err_erase_id:
> +	xa_erase(&liteuart_array, uart->id);
> +
> +	return ret;
>  }
>  
>  static int liteuart_remove(struct platform_device *pdev)
> -- 
> 2.32.0
>