From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: Tue, 26 Aug 2008 18:52:47 +0000 (+0100)
Subject: tty: TIOCGSOFTCAR/SSOFTCAR on pty is wron
X-Git-Tag: v2.6.27-rc5~12
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f753f3272b4d2108d1e4b121ddcde504737a8693;p=linux-2.6

tty: TIOCGSOFTCAR/SSOFTCAR on pty is wron

The termios settings ioctls on a pty should affect the bound tty side not
the pty. The SOFTCAR ioctls use the wrong device file.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c
index ea9fc5d03b..bf34e45974 100644
--- a/drivers/char/tty_ioctl.c
+++ b/drivers/char/tty_ioctl.c
@@ -937,12 +937,14 @@ int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
 			return 0;
 #endif
 	case TIOCGSOFTCAR:
-		return put_user(C_CLOCAL(tty) ? 1 : 0,
+		/* FIXME: for correctness we may need to take the termios
+		   lock here - review */
+		return put_user(C_CLOCAL(real_tty) ? 1 : 0,
 						(int __user *)arg);
 	case TIOCSSOFTCAR:
 		if (get_user(arg, (unsigned int __user *) arg))
 			return -EFAULT;
-		return tty_change_softcar(tty, arg);
+		return tty_change_softcar(real_tty, arg);
 	default:
 		return -ENOIOCTLCMD;
 	}