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>
diff --git a/sound/core/control.c b/sound/core/control.c
index 4b20fa2..17b8d47 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -723,14 +723,11 @@
{
struct snd_ctl_elem_value *control;
int result;
-
- control = kmalloc(sizeof(*control), GFP_KERNEL);
- if (control == NULL)
- return -ENOMEM;
- if (copy_from_user(control, _control, sizeof(*control))) {
- kfree(control);
- return -EFAULT;
- }
+
+ control = memdup_user(_control, sizeof(*control));
+ if (IS_ERR(control))
+ return PTR_ERR(control);
+
snd_power_lock(card);
result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
if (result >= 0)
@@ -784,13 +781,10 @@
struct snd_card *card;
int result;
- control = kmalloc(sizeof(*control), GFP_KERNEL);
- if (control == NULL)
- return -ENOMEM;
- if (copy_from_user(control, _control, sizeof(*control))) {
- kfree(control);
- return -EFAULT;
- }
+ control = memdup_user(_control, sizeof(*control));
+ if (IS_ERR(control))
+ return PTR_ERR(control);
+
card = file->card;
snd_power_lock(card);
result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
@@ -916,13 +910,10 @@
if (op_flag > 0) {
if (size > 1024 * 128) /* sane value */
return -EINVAL;
- new_data = kmalloc(size, GFP_KERNEL);
- if (new_data == NULL)
- return -ENOMEM;
- if (copy_from_user(new_data, tlv, size)) {
- kfree(new_data);
- return -EFAULT;
- }
+
+ new_data = memdup_user(tlv, size);
+ if (IS_ERR(new_data))
+ return PTR_ERR(new_data);
change = ue->tlv_data_size != size;
if (!change)
change = memcmp(ue->tlv_data, new_data, size);