[PATCH v2 RESEND] usb: Use memdup_user to reuse the code

From: Pathak, Rahul (R.)
Date: Fri Dec 11 2015 - 00:41:49 EST


From: Rahul Pathak <rpathak@xxxxxxxxxxx>

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


Signed-off-by: Rahul Pathak <rpathak@xxxxxxxxxxx>

---

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

---
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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