ALSA: sound/usb: use memdup_user()

Remove open-coded memdup_user().

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 3 insertions, 7 deletions

diff --git a/sound/usb/usx2y/us122l.c b/sound/usb/usx2y/us122l.c
index 98276aafefe6..012ff1f6f8af 100644
--- a/sound/usb/usx2y/us122l.c
+++ b/sound/usb/usx2y/us122l.c
@@ -349,14 +349,10 @@ static int usb_stream_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
         if (cmd != SNDRV_USB_STREAM_IOCTL_SET_PARAMS)
                 return -ENOTTY;
 
-        cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
-        if (!cfg)
-                return -ENOMEM;
+        cfg = memdup_user((void *)arg, sizeof(*cfg));
+        if (IS_ERR(cfg))
+                return PTR_ERR(cfg);
 
-        if (copy_from_user(cfg, (void *)arg, sizeof(*cfg))) {
-                err = -EFAULT;
-                goto free;
-        }
         if (cfg->version != USB_STREAM_INTERFACE_VERSION) {
                 err = -ENXIO;
                 goto free;