linux-kernel - [patch] vt_ioctl: return -EFAULT on copy_from

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Message-ID: <20100604102046.GY5483@bicker>
Date:	Fri, 4 Jun 2010 12:20:46 +0200
From:	Dan Carpenter <error27@...il.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	Alan Cox <alan@...ux.intel.com>, Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] vt_ioctl: return -EFAULT on copy_from_user errors

copy_from_user() returns the number of bytes remaining but we want to
return a negative error code here.

Signed-off-by: Dan Carpenter <error27@...il.com>

diff --git a/drivers/char/vt_ioctl.c b/drivers/char/vt_ioctl.c
index 6aa1028..cb19dbc 100644
--- a/drivers/char/vt_ioctl.c
+++ b/drivers/char/vt_ioctl.c
@@ -1303,7 +1303,9 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
 		if (!perm)
 			goto eperm;
 		ret = copy_from_user(&ui, up, sizeof(struct unimapinit));
-		if (!ret)
+		if (ret)
+			ret = -EFAULT;
+		else
 			con_clear_unimap(vc, &ui);
 		break;
 	      }
--
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