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Diffstat (limited to 'sound/core/control.c')
-rw-r--r--sound/core/control.c38
1 files changed, 25 insertions, 13 deletions
diff --git a/sound/core/control.c b/sound/core/control.c
index aa0c0cf182af..e014598142df 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -717,22 +717,19 @@ static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,
}
static int snd_ctl_elem_list(struct snd_card *card,
- struct snd_ctl_elem_list __user *_list)
+ struct snd_ctl_elem_list *list)
{
- struct snd_ctl_elem_list list;
struct snd_kcontrol *kctl;
struct snd_ctl_elem_id id;
unsigned int offset, space, jidx;
int err = 0;
- if (copy_from_user(&list, _list, sizeof(list)))
- return -EFAULT;
- offset = list.offset;
- space = list.space;
+ offset = list->offset;
+ space = list->space;
down_read(&card->controls_rwsem);
- list.count = card->controls_count;
- list.used = 0;
+ list->count = card->controls_count;
+ list->used = 0;
if (space > 0) {
list_for_each_entry(kctl, &card->controls, list) {
if (offset >= kctl->count) {
@@ -741,12 +738,12 @@ static int snd_ctl_elem_list(struct snd_card *card,
}
for (jidx = offset; jidx < kctl->count; jidx++) {
snd_ctl_build_ioff(&id, kctl, jidx);
- if (copy_to_user(list.pids + list.used, &id,
+ if (copy_to_user(list->pids + list->used, &id,
sizeof(id))) {
err = -EFAULT;
goto out;
}
- list.used++;
+ list->used++;
if (!--space)
goto out;
}
@@ -755,11 +752,26 @@ static int snd_ctl_elem_list(struct snd_card *card,
}
out:
up_read(&card->controls_rwsem);
- if (!err && copy_to_user(_list, &list, sizeof(list)))
- err = -EFAULT;
return err;
}
+static int snd_ctl_elem_list_user(struct snd_card *card,
+ struct snd_ctl_elem_list __user *_list)
+{
+ struct snd_ctl_elem_list list;
+ int err;
+
+ if (copy_from_user(&list, _list, sizeof(list)))
+ return -EFAULT;
+ err = snd_ctl_elem_list(card, &list);
+ if (err)
+ return err;
+ if (copy_to_user(_list, &list, sizeof(list)))
+ return -EFAULT;
+
+ return 0;
+}
+
/* Check whether the given kctl info is valid */
static int snd_ctl_check_elem_info(struct snd_card *card,
const struct snd_ctl_elem_info *info)
@@ -1703,7 +1715,7 @@ static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg
case SNDRV_CTL_IOCTL_CARD_INFO:
return snd_ctl_card_info(card, ctl, cmd, argp);
case SNDRV_CTL_IOCTL_ELEM_LIST:
- return snd_ctl_elem_list(card, argp);
+ return snd_ctl_elem_list_user(card, argp);
case SNDRV_CTL_IOCTL_ELEM_INFO:
return snd_ctl_elem_info_user(ctl, argp);
case SNDRV_CTL_IOCTL_ELEM_READ: