From 2ece068e1b1d6e76ecd07e04b027013e931287ff Mon Sep 17 00:00:00 2001
From: Muhammad Falak R Wani <falakreyaz@gmail.com>
Date: Fri, 20 May 2016 17:51:02 +0530
Subject: [PATCH] ptp: use memdup_user().

Use memdup_user to duplicate a memory region from user-space to
kernel-space, instead of open coding using kmalloc & copy_from_user.

Signed-off-by: Muhammad Falak R Wani <falakreyaz@gmail.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/ptp/ptp_chardev.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
index 579fd65299a0..0b1ac6be69ce 100644
--- a/drivers/ptp/ptp_chardev.c
+++ b/drivers/ptp/ptp_chardev.c
@@ -208,14 +208,9 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
 		break;
 
 	case PTP_SYS_OFFSET:
-		sysoff = kmalloc(sizeof(*sysoff), GFP_KERNEL);
-		if (!sysoff) {
-			err = -ENOMEM;
-			break;
-		}
-		if (copy_from_user(sysoff, (void __user *)arg,
-				   sizeof(*sysoff))) {
-			err = -EFAULT;
+		sysoff = memdup_user((void __user *)arg, sizeof(*sysoff));
+		if (IS_ERR(sysoff)) {
+			err = PTR_ERR(sysoff);
 			break;
 		}
 		if (sysoff->n_samples > PTP_MAX_SAMPLES) {