serial: sh-sci: Don't allow CS5-6

Only CS7 and CS8 seem supported but CSIZE is not sanitized from
CS5 or CS6 to CS8.

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().

Fixes: 1da177e4c3f4 (Linux-2.6.12-rc2)
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220519081808.3776-6-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 0f9b8bd..0075a14 100644 (file)
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -2379,8 +2379,12 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
        int best_clk = -1;
        unsigned long flags;
 
-       if ((termios->c_cflag & CSIZE) == CS7)
+       if ((termios->c_cflag & CSIZE) == CS7) {
                smr_val |= SCSMR_CHR;
+       } else {
+               termios->c_cflag &= ~CSIZE;
+               termios->c_cflag |= CS8;
+       }
        if (termios->c_cflag & PARENB)
                smr_val |= SCSMR_PE;
        if (termios->c_cflag & PARODD)