linux-kernel - [PATCH] usb: cdc-wdm: use memdup

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Date:   Sat,  6 May 2017 23:42:18 +0800
From:   Geliang Tang <geliangtang@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Oliver Neukum <oneukum@...e.com>,
        Bjørn Mork <bjorn@...k.no>
Cc:     Geliang Tang <geliangtang@...il.com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] usb: cdc-wdm: 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/class/cdc-wdm.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 08669fe..0e4f18c 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -361,17 +361,9 @@ static ssize_t wdm_write
 	if (we < 0)
 		return usb_translate_errors(we);
 
-	buf = kmalloc(count, GFP_KERNEL);
-	if (!buf) {
-		rv = -ENOMEM;
-		goto outnl;
-	}
-
-	r = copy_from_user(buf, buffer, count);
-	if (r > 0) {
-		rv = -EFAULT;
-		goto out_free_mem;
-	}
+	buf = memdup_user(buffer, count);
+	if (IS_ERR(buf))
+		return PTR_ERR(buf);
 
 	/* concurrent writes and disconnect */
 	r = mutex_lock_interruptible(&desc->wlock);
@@ -441,7 +433,6 @@ static ssize_t wdm_write
 
 	usb_autopm_put_interface(desc->intf);
 	mutex_unlock(&desc->wlock);
-outnl:
 	return rv < 0 ? rv : count;
 
 out_free_mem_pm:
-- 
2.9.3