From 4ed60fc257185dbb0daea7cd3e4289d1658b11f6 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Thu, 16 Oct 2014 15:33:28 -0400 Subject: [PATCH] pty: Hold ctrl_lock for packet mode updates Updates to the packet mode enable require holding the ctrl_lock; the serialization prevents corruption of adjacent fields. Signed-off-by: Peter Hurley Reviewed-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- drivers/tty/pty.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c index bcec4c71a408..7a1a53819e22 100644 --- a/drivers/tty/pty.c +++ b/drivers/tty/pty.c @@ -47,7 +47,9 @@ static void pty_close(struct tty_struct *tty, struct file *filp) set_bit(TTY_IO_ERROR, &tty->flags); wake_up_interruptible(&tty->read_wait); wake_up_interruptible(&tty->write_wait); + spin_lock_irq(&tty->ctrl_lock); tty->packet = 0; + spin_unlock_irq(&tty->ctrl_lock); /* Review - krefs on tty_link ?? */ if (!tty->link) return; -- 2.30.2