Merge branch 'topic/memdup_user' into for-linus

* topic/memdup_user:
  ALSA: sound/pci: use memdup_user()
  ALSA: sound/usb: use memdup_user()
  ALSA: sound/isa: use memdup_user()
  ALSA: sound/core: use memdup_user()

1 files changed, 13 insertions, 22 deletions

diff --git a/sound/core/control.c b/sound/core/control.c
index 4b20fa2b7e6..17b8d47a5cd 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -723,14 +723,11 @@ static int snd_ctl_elem_read_user(struct snd_card *card,
 {
 	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 @@ static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
 	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 @@ static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
 	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);