linux-kernel - Re: [PATCH 2/9] serial: digicolor-usart: Don't allow CS5-6

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Message-ID: <87tu9nqxtk.fsf@tarshish>
Date:   Wed, 18 May 2022 07:16:01 +0300
From:   Baruch Siach <baruch@...s.co.il>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     linux-serial@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/9] serial: digicolor-usart: Don't allow CS5-6

Hi Ilpo,

On Tue, May 17 2022, Ilpo Järvinen wrote:
> Only CS7 and CS8 seem supported but CSIZE is not sanitized to CS8 in
> the default: block.
>
> Set CSIZE correctly so that userspace knows the effective value.
> Incorrect CSIZE also results in miscalculation of the frame bits in
> tty_get_char_size() or in its predecessor where the roughly the same
> code is directly within uart_update_timeout().
>
> Cc: Baruch Siach <baruch@...s.co.il>
> Fixes: 5930cb3511df (serial: driver for Conexant Digicolor USART)
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

Acked-by: Baruch Siach <baruch@...s.co.il>

Thanks,
baruch

> ---
>  drivers/tty/serial/digicolor-usart.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/tty/serial/digicolor-usart.c b/drivers/tty/serial/digicolor-usart.c
> index 6d70fea76bb3..65e653eb5026 100644
> --- a/drivers/tty/serial/digicolor-usart.c
> +++ b/drivers/tty/serial/digicolor-usart.c
> @@ -309,6 +309,8 @@ static void digicolor_uart_set_termios(struct uart_port *port,
>  	case CS8:
>  	default:
>  		config |= UA_CONFIG_CHAR_LEN;
> +		termios->c_cflag &= ~CSIZE;
> +		termios->c_cflag |= CS8;
>  		break;
>  	}


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