D57401.1794349947.diff
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	diff --git a/sys/kern/tty.c b/sys/kern/tty.c
	--- a/sys/kern/tty.c
	+++ b/sys/kern/tty.c
	@@ -320,13 +320,23 @@
	tp->t_termios = tp->t_termios_init_out;
	else
	tp->t_termios = tp->t_termios_init_in;
	- ttydevsw_param(tp, &tp->t_termios);
	+ (void)ttydevsw_param(tp, &tp->t_termios);
	+ if (tty_gone(tp)) {
	+ error = ENXIO;
	+ goto done;
	+ }
	+
	/* Prevent modem control on callout devices and /dev/console. */
	if (TTY_CALLOUT(tp, dev) \|\| dev == dev_console)
	tp->t_termios.c_cflag \|= CLOCAL;

	if ((tp->t_termios.c_cflag & CNO_RTSDTR) == 0)
	- ttydevsw_modem(tp, SER_DTR\|SER_RTS, 0);
	+ (void)ttydevsw_modem(tp, SER_DTR\|SER_RTS, 0);
	+
	+ if (tty_gone(tp)) {
	+ error = ENXIO;
	+ goto done;
	+ }

	error = ttydevsw_open(tp);
	if (error != 0)
	@@ -348,6 +358,11 @@
	}
	}

	+ if (tty_gone(tp)) {
	+ error = ENXIO;
	+ goto done;
	+ }
	+
	if (dev == dev_console)
	tp->t_flags \|= TF_OPENED_CONS;
	else if (TTY_CALLOUT(tp, dev))