linux-kernel - [patch 1/2] ptp: return -EFAULT on copy_to

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Date:	Sun, 29 May 2011 22:53:12 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Richard Cochran <richard.cochran@...cron.at>
Cc:	"David S. Miller" <davem@...emloft.net>,
	John Stultz <john.stultz@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	open list <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org
Subject: [patch 1/2] ptp: return -EFAULT on copy_to_user() errors

copy_to_user() returns the number of bytes remaining, but we want a
negative error code here.

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

diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
index a8d03ae..93fa22d 100644
--- a/drivers/ptp/ptp_chardev.c
+++ b/drivers/ptp/ptp_chardev.c
@@ -46,7 +46,8 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
 		caps.n_ext_ts = ptp->info->n_ext_ts;
 		caps.n_per_out = ptp->info->n_per_out;
 		caps.pps = ptp->info->pps;
-		err = copy_to_user((void __user *)arg, &caps, sizeof(caps));
+		if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
+			err = -EFAULT;
 		break;
 
 	case PTP_EXTTS_REQUEST:
--
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