linux-kernel - [PATCH] USB: iowarrior: use memdup

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Date:   Sat, 13 May 2017 11:16:00 +0800
From:   Geliang Tang <geliangtang@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johan Hovold <johan@...nel.org>,
        Wolfram Sang <wsa-dev@...g-engineering.com>
Cc:     Geliang Tang <geliangtang@...il.com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] USB: iowarrior: use memdup_user

Use memdup_user() helper instead of open-coding to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@...il.com>
---
 drivers/usb/misc/iowarrior.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
index 7756953..816afad 100644
--- a/drivers/usb/misc/iowarrior.c
+++ b/drivers/usb/misc/iowarrior.c
@@ -368,14 +368,9 @@ static ssize_t iowarrior_write(struct file *file,
 	case USB_DEVICE_ID_CODEMERCS_IOWPV2:
 	case USB_DEVICE_ID_CODEMERCS_IOW40:
 		/* IOW24 and IOW40 use a synchronous call */
-		buf = kmalloc(count, GFP_KERNEL);
-		if (!buf) {
-			retval = -ENOMEM;
-			goto exit;
-		}
-		if (copy_from_user(buf, user_buffer, count)) {
-			retval = -EFAULT;
-			kfree(buf);
+		buf = memdup_user(user_buffer, count);
+		if (IS_ERR(buf)) {
+			retval = PTR_ERR(buf);
 			goto exit;
 		}
 		retval = usb_set_report(dev->interface, 2, 0, buf, count);
-- 
2.9.3