ALSA: sound/core: 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, 4 insertions, 7 deletions

diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c
index 36d7a599823..08bfed594a8 100644
--- a/sound/core/pcm_compat.c
+++ b/sound/core/pcm_compat.c
@@ -232,14 +232,11 @@ static int snd_pcm_ioctl_hw_params_compat(struct snd_pcm_substream *substream,
         if (! (runtime = substream->runtime))
                 return -ENOTTY;
 
-        data = kmalloc(sizeof(*data), GFP_KERNEL);
-        if (data == NULL)
-                return -ENOMEM;
         /* only fifo_size is different, so just copy all */
-        if (copy_from_user(data, data32, sizeof(*data32))) {
-                err = -EFAULT;
-                goto error;
-        }
+        data = memdup_user(data32, sizeof(*data32));
+        if (IS_ERR(data))
+                return PTR_ERR(data);
+
         if (refine)
                 err = snd_pcm_hw_refine(substream, data);
         else