linux-kernel - [patch] Staging: rc2860: return -EFAULT on copy_to

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Message-ID: <20100604103951.GE5483@bicker>
Date:	Fri, 4 Jun 2010 12:39:51 +0200
From:	Dan Carpenter <error27@...il.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] Staging: rc2860: return -EFAULT on copy_to_user errors

copy_to_user() returns the number of bytes remaining but we want to
return a negative error code.  This is in the ioctl handler and the
error code gets passed to userspace.

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

diff --git a/drivers/staging/rt2860/sta_ioctl.c b/drivers/staging/rt2860/sta_ioctl.c
index 112da7a..6b8268d 100644
--- a/drivers/staging/rt2860/sta_ioctl.c
+++ b/drivers/staging/rt2860/sta_ioctl.c
@@ -2522,6 +2522,8 @@ int rt28xx_sta_ioctl(IN struct net_device *net_dev,
 			Status =
 			    copy_to_user(erq->pointer, pAd->nickname,
 					 erq->length);
+			if (Status)
+				Status = -EFAULT;
 			break;
 		}
 	case SIOCGIWRATE:	/*get default bit rate (bps) */
--
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