linux-kernel - [PATCH] usb: gadget: f_fs: use memdup

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Message-Id: <694b8a4beb2ec1e087321bc423e5cd0c69e5a717.1494576863.git.geliangtang@gmail.com>
Date:   Sat, 13 May 2017 11:15:59 +0800
From:   Geliang Tang <geliangtang@...il.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michal Nazarewicz <mina86@...a86.com>,
        Vincent Pelletier <plr.vincent@...il.com>,
        Felix Hädicke <felixhaedicke@....de>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Jim Lin <jilin@...dia.com>
Cc:     Geliang Tang <geliangtang@...il.com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] usb: gadget: f_fs: 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/gadget/function/f_fs.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 71dd27c..5754538 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -3692,14 +3692,9 @@ static char *ffs_prepare_buffer(const char __user *buf, size_t len)
 	if (unlikely(!len))
 		return NULL;
 
-	data = kmalloc(len, GFP_KERNEL);
-	if (unlikely(!data))
-		return ERR_PTR(-ENOMEM);
-
-	if (unlikely(copy_from_user(data, buf, len))) {
-		kfree(data);
-		return ERR_PTR(-EFAULT);
-	}
+	data = memdup_user(buf, len);
+	if (unlikely(IS_ERR(data)))
+		return data;
 
 	pr_vdebug("Buffer from user space:\n");
 	ffs_dump_mem("", data, len);
-- 
2.9.3