This is a note to let you know that I've just added the patch titled
serial: rda-uart: Don't allow CS5-6
to the 5.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
serial-rda-uart-don-t-allow-cs5-6.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d03a7ef46b0ea0f2d4d36965444c4eb421ff1e14
Author: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Date: Thu May 19 11:18:02 2022 +0300
serial: rda-uart: Don't allow CS5-6
[ Upstream commit 098333a9c7d12bb3ce44c82f08b4d810c44d31b0 ]
Only CS7 and CS8 are supported but CSIZE is not sanitized after
fallthrough from CS5 or CS6 to CS7.
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: c10b13325ced (tty: serial: Add RDA8810PL UART driver)
Cc: Manivannan Sadhasivam <mani@xxxxxxxxxx>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220519081808.3776-4-ilpo.jarvinen@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/tty/serial/rda-uart.c b/drivers/tty/serial/rda-uart.c
index e5f1fded423a..f556b4955f59 100644
--- a/drivers/tty/serial/rda-uart.c
+++ b/drivers/tty/serial/rda-uart.c
@@ -262,6 +262,8 @@ static void rda_uart_set_termios(struct uart_port *port,
fallthrough;
case CS7:
ctrl &= ~RDA_UART_DBITS_8;
+ termios->c_cflag &= ~CSIZE;
+ termios->c_cflag |= CS7;
break;
default:
ctrl |= RDA_UART_DBITS_8;
