[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 <geliangt...@gmail.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