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Commit 9d1807da authored by Al Viro's avatar Al Viro
Browse files

vt_compat_ioctl(): clean up, use compat_ptr() properly 



we need it for "convert the structure" cases too

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 09d88c85

drivers/tty/vt/vt_ioctl.c

+9 −22
Original line number Diff line number Diff line
@@ -1171,17 +1171,13 @@ long vt_compat_ioctl(struct tty_struct *tty, 
{

	struct vc_data *vc = tty->driver_data;

	struct console_font_op op;	/* used in multiple places here */

	unsigned int console;

	void __user *up = (void __user *)arg;

	unsigned int console = vc->vc_num;

	void __user *up = compat_ptr(arg);

	int perm;

	int ret = 0;



	console = vc->vc_num;



	if (!vc_cons_allocated(console)) { 	/* impossible? */

		ret = -ENOIOCTLCMD;

		goto out;

	}

	if (!vc_cons_allocated(console)) 	/* impossible? */

		return -ENOIOCTLCMD;



	/*

	 * To have permissions to do most of the vt ioctls, we either have
@@ -1197,17 +1193,14 @@ long vt_compat_ioctl(struct tty_struct *tty, 
	 */

	case PIO_FONTX:

	case GIO_FONTX:

		ret = compat_fontx_ioctl(cmd, up, perm, &op);

		break;

		return compat_fontx_ioctl(cmd, up, perm, &op);



	case KDFONTOP:

		ret = compat_kdfontop_ioctl(up, perm, &op, vc);

		break;

		return compat_kdfontop_ioctl(up, perm, &op, vc);



	case PIO_UNIMAP:

	case GIO_UNIMAP:

		ret = compat_unimap_ioctl(cmd, up, perm, vc);

		break;

		return compat_unimap_ioctl(cmd, up, perm, vc);



	/*

	 * all these treat 'arg' as an integer
@@ -1232,21 +1225,15 @@ long vt_compat_ioctl(struct tty_struct *tty, 
	case VT_DISALLOCATE:

	case VT_RESIZE:

	case VT_RESIZEX:

		goto fallback;

		return vt_ioctl(tty, cmd, arg);



	/*

	 * the rest has a compatible data structure behind arg,

	 * but we have to convert it to a proper 64 bit pointer.

	 */

	default:

		arg = (unsigned long)compat_ptr(arg);

		goto fallback;

		return vt_ioctl(tty, cmd, (unsigned long)up);

	}

out:

	return ret;



fallback:

	return vt_ioctl(tty, cmd, arg);

}