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pty: Hold ctrl_lock for packet mode updates

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Updates to the packet mode enable require holding the ctrl_lock;
the serialization prevents corruption of adjacent fields.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Reviewed-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2014-10-16 15:33:28 -04:00 committed by Greg Kroah-Hartman
parent 2622d73e51
commit 4ed60fc257
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/pty.c
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@ -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;