[PATCH] usb: gadget: f_fs: use memdup_user

[Geliang Tang]

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

Signed-off-by: Geliang Tang <geliangtang@xxxxxxxxx>
---
 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