[PATCH 5.4 310/411] serial: txx9: Dont allow CS5-6

Greg Kroah-Hartman
2022-06-13T11:39:48Z

From: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

[ Upstream commit 79ac88655dc0551e3571ad16bdabdbe65d61553e ]

Only CS7 and CS8 are supported but CSIZE is not sanitized with
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/20220519081808.3776-5-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/tty/serial/serial_txx9.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
index 8507f18900d0..2783baa5dfe5 100644
--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -648,6 +648,8 @@ serial_txx9_set_termios(struct uart_port *port, struct ktermios *termios,
case CS6: /* not supported */
case CS8:
cval |= TXX9_SILCR_UMODE_8BIT;
+ termios->c_cflag &= ~CSIZE;
+ termios->c_cflag |= CS8;
break;
}

--
2.35.1