linux-kernel - Re: [PATCH 2/3] serial: liteuart: fix use-after-free and memleak on unbind

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Date:   Tue, 16 Nov 2021 06:15:05 +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 2/3] serial: liteuart: fix use-after-free and memleak on
 unbind

On Mon, Nov 15, 2021 at 02:37:44PM +0100, Johan Hovold wrote:
> Deregister the port when unbinding the driver to prevent it from being
> used after releasing the driver data and leaking memory allocated by
> serial core.

This looks good to me.  Just curious did you test this on a Litex SoC/FPGA?

> 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 | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/tty/serial/liteuart.c b/drivers/tty/serial/liteuart.c
> index f075f4ff5fcf..da792d0df790 100644
> --- a/drivers/tty/serial/liteuart.c
> +++ b/drivers/tty/serial/liteuart.c
> @@ -295,6 +295,7 @@ static int liteuart_remove(struct platform_device *pdev)
>  	struct uart_port *port = platform_get_drvdata(pdev);
>  	struct liteuart_port *uart = to_liteuart_port(port);
>  
> +	uart_remove_one_port(&liteuart_driver, port);
>  	xa_erase(&liteuart_array, uart->id);
>  
>  	return 0;
> -- 
> 2.32.0
>