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

[Stafford Horne]

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@xxxxxxxxxxxxxxx      # 5.11
> Cc: Filip Kokosinski <fkokosinski@xxxxxxxxxxxx>
> Cc: Mateusz Holenko <mholenko@xxxxxxxxxxxx>
> Cc: Stafford Horne <shorne@xxxxxxxxx>
> Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>

Reviewed-by: Stafford Horne <shorne@xxxxxxxxx>

> ---
>  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
>