[PATCH] usb: use memdup_user()

[Li Hong <lihong.hi@xxxxxxxxx>]

Replace a combination call of kmalloc() and copy_from_user() with memdup_user().

Signed-off-by: Li Hong <lihong.hi@xxxxxxxxx>
---
 drivers/usb/class/cdc-wdm.c |   15 ++++-----------
 1 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 0fe4345..326ecf3 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -324,18 +324,11 @@ static ssize_t wdm_write
                goto out;
        }

-       desc->outbuf = buf = kmalloc(count, GFP_KERNEL);
-       if (!buf) {
-               rv = -ENOMEM;
+       desc->outbuf = buf = memdup_user(buffer, count);
+       if (IS_ERR(buf)) {
+               rv = PTR_ERR(buf);
                goto out;
-       }
-
-       r = copy_from_user(buf, buffer, count);
-       if (r > 0) {
-               kfree(buf);
-               rv = -EFAULT;
-               goto out;
-       }
+       }

        req = desc->orq;
        usb_fill_control_urb(
-- 
1.6.2.GIT
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