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Commit f604529d authored by Takashi Iwai's avatar Takashi Iwai
Browse files

Merge branch 'topic/ctl-add-remove-fixes' into for-linus 

* topic/ctl-add-remove-fixes:
  sound: snd_ctl_remove_user_ctl: prevent removal of kernel controls
  sound: snd_ctl_remove_unlocked_id: simplify user control counting
  sound: snd_ctl_remove_unlocked_id: simplify error paths
  sound: snd_ctl_elem_add: fix value count check
parents 124e39b3 18dd0aa5

sound/core/control.c

+17 −17
Original line number Original line Diff line number Diff line
@@ -414,7 +414,7 @@ int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) 
EXPORT_SYMBOL(snd_ctl_remove_id);

EXPORT_SYMBOL(snd_ctl_remove_id);





/**

/**

 * snd_ctl_remove_unlocked_id - remove the unlocked control of the given id and release it

 * snd_ctl_remove_user_ctl - remove and release the unlocked user control

 * @file: active control handle

 * @file: active control handle

 * @id: the control id to remove

 * @id: the control id to remove

 *

 *
@@ -423,7 +423,7 @@ EXPORT_SYMBOL(snd_ctl_remove_id); 
 * 

 * 

 * Returns 0 if successful, or a negative error code on failure.

 * Returns 0 if successful, or a negative error code on failure.

 */

 */

static int snd_ctl_remove_unlocked_id(struct snd_ctl_file * file,

static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,

				   struct snd_ctl_elem_id *id)

				   struct snd_ctl_elem_id *id)

{

{

	struct snd_card *card = file->card;

	struct snd_card *card = file->card;
@@ -433,15 +433,23 @@ static int snd_ctl_remove_unlocked_id(struct snd_ctl_file * file, 
	down_write(&card->controls_rwsem);

	down_write(&card->controls_rwsem);

	kctl = snd_ctl_find_id(card, id);

	kctl = snd_ctl_find_id(card, id);

	if (kctl == NULL) {

	if (kctl == NULL) {

		up_write(&card->controls_rwsem);

		ret = -ENOENT;

		return -ENOENT;

		goto error;

	}

	if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) {

		ret = -EINVAL;

		goto error;

	}

	}

	for (idx = 0; idx < kctl->count; idx++)

	for (idx = 0; idx < kctl->count; idx++)

		if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {

		if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {

			up_write(&card->controls_rwsem);

			ret = -EBUSY;

			return -EBUSY;

			goto error;

		}

		}

	ret = snd_ctl_remove(card, kctl);

	ret = snd_ctl_remove(card, kctl);

	if (ret < 0)

		goto error;

	card->user_ctl_count--;

error:

	up_write(&card->controls_rwsem);

	up_write(&card->controls_rwsem);

	return ret;

	return ret;

}

}
@@ -951,7 +959,7 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file, 
	

	

	if (card->user_ctl_count >= MAX_USER_CONTROLS)

	if (card->user_ctl_count >= MAX_USER_CONTROLS)

		return -ENOMEM;

		return -ENOMEM;

	if (info->count > 1024)

	if (info->count < 1)

		return -EINVAL;

		return -EINVAL;

	access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :

	access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :

		(info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|

		(info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
@@ -1052,18 +1060,10 @@ static int snd_ctl_elem_remove(struct snd_ctl_file *file, 
			       struct snd_ctl_elem_id __user *_id)

			       struct snd_ctl_elem_id __user *_id)

{

{

	struct snd_ctl_elem_id id;

	struct snd_ctl_elem_id id;

	int err;





	if (copy_from_user(&id, _id, sizeof(id)))

	if (copy_from_user(&id, _id, sizeof(id)))

		return -EFAULT;

		return -EFAULT;

	err = snd_ctl_remove_unlocked_id(file, &id);

	return snd_ctl_remove_user_ctl(file, &id);

	if (! err) {

		struct snd_card *card = file->card;

		down_write(&card->controls_rwsem);

		card->user_ctl_count--;

		up_write(&card->controls_rwsem);

	}

	return err;

}

}





static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)

static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)