From 467e627672eaddc88a6121f809313d8451422f4e Mon Sep 17 00:00:00 2001
From: Brooks Davis <brooks@FreeBSD.org>
Date: Mon, 12 Mar 2018 23:04:42 +0000
Subject: [PATCH] Use the stack for temporary storage in OTIOCCONS.

The old code used the thread's pcb via the uap->data pointer.

Reviewed by:	ed
Approved by:	CheriBSD
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D14674
---
 sys/kern/tty_compat.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/sys/kern/tty_compat.c b/sys/kern/tty_compat.c
index 8a4545c64e3f..b61e05859f93 100644
--- a/sys/kern/tty_compat.c
+++ b/sys/kern/tty_compat.c
@@ -262,9 +262,11 @@ tty_ioctl_compat(struct tty *tp, u_long com, caddr_t data, int fflag,
 			fflag, td));
 	    }
 
-	case OTIOCCONS:
-		*(int *)data = 1;
-		return (tty_ioctl(tp, TIOCCONS, data, fflag, td));
+	case OTIOCCONS: {
+		int one = 1;
+
+		return (tty_ioctl(tp, TIOCCONS, (caddr_t)&one, fflag, td));
+	}
 
 	default:
 		return (ENOIOCTL);