linux-kernel - [PATCH v2] usb: Use memdup

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Message-ID: <20151208122358.GA17073@visteon.com>
Date:	Tue, 8 Dec 2015 12:24:05 +0000
From:	"Pathak, Rahul (R.)" <rpathak@...teon.com>
To:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"stern@...land.harvard.edu" <stern@...land.harvard.edu>,
	"kborer@...il.com" <kborer@...il.com>,
	"dan.carpenter@...cle.com" <dan.carpenter@...cle.com>,
	"chasemetzger15@...il.com" <chasemetzger15@...il.com>
CC:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] usb: Use memdup_user to reuse the code

From: Rahul Pathak <rpathak@...teon.com>

Fixing coccicheck warning which recommends to use memdup_user instead
to reimplement its code, using memdup_user simplifies the code

./drivers/usb/core/devio.c:1398:11-18: WARNING opportunity for memdup_user

Changes after v1: setting isopkt=NULL for proper kfree() call

Signed-off-by: Rahul Pathak <rpathak@...teon.com>
---
 drivers/usb/core/devio.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 38ae877c..844407c 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1395,11 +1395,10 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb
 		number_of_packets = uurb->number_of_packets;
 		isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
 				   number_of_packets;
-		isopkt = kmalloc(isofrmlen, GFP_KERNEL);
-		if (!isopkt)
-			return -ENOMEM;
-		if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
-			ret = -EFAULT;
+		isopkt = memdup_user(iso_frame_desc, isofrmlen);
+		if (IS_ERR(isopkt)) {
+			ret = PTR_ERR(isopkt);
+			isopkt = NULL;
 			goto error;
 		}
 		for (totlen = u = 0; u < number_of_packets; u++) {
-- 
1.9.1
--
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