Commit 3f40f5b2 authored Nov 05, 2014 by Peter Hurley Committed by Greg Kroah-Hartman Nov 06, 2014

tty: Flush tty buffers after hardware shutdown



The line discipline buffer and the tty buffers must be flushed again
after hardware shutdown; otherwise, a brief window exists between the
ldisc flush in tty_port_close_start() and the subsequent
tty_port_shutdown(), during which more data could be received into the
tty buffers. A racing open might then be able to receive data from the
previous session.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 413ba638

drivers/tty/tty_port.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -520,6 +520,7 @@ void tty_port_close_end(struct tty_port port, struct tty_struct tty)
		{
		unsigned long flags;

		tty_ldisc_flush(tty);
		tty->closing = 0;

		spin_lock_irqsave(&port->lock, flags);