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serial: fix TIOCSRS485 locking 

commit 9e4f2a8004 upstream.

The RS485 multipoint addressing support for some reason added a new
ADDRB termios cflag which is (only!) updated from one of the RS485
ioctls.

Make sure to take the termios rw semaphore for the right ioctl (i.e.
set, not get).

Fixes: ae50bb2752 ("serial: take termios_rwsem for ->rs485_config() & pass termios as param")
Cc: stable@vger.kernel.org	# 6.0
Cc: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20230412124811.11217-1-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2023-04-12 14:48:11 +02:00 committed by Greg Kroah-Hartman
parent 27df5bca96
commit 719a2f969b
1 changed files with 2 additions and 2 deletions
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4
drivers/tty/serial/serial_core.c
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@ -1552,7 +1552,7 @@ uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
goto out;
/* rs485_config requires more locking than others */
if (cmd == TIOCGRS485)
if (cmd == TIOCSRS485)
down_write(&tty->termios_rwsem);
mutex_lock(&port->mutex);
@ -1595,7 +1595,7 @@ uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
}
out_up:
mutex_unlock(&port->mutex);
if (cmd == TIOCGRS485)
if (cmd == TIOCSRS485)
up_write(&tty->termios_rwsem);
out:
return ret;