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sound: snd_ctl_remove_user_ctl: prevent removal of kernel controls

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Ensure that userspace can remove only user controls.  Controls created
by kernel drivers must not be removed because they might be referenced
in calls to snd_ctl_notify().

Signed-off-by: Clemens Ladisch <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
This commit is contained in:
Clemens Ladisch 2009-08-17 12:28:09 +02:00 • committed by Takashi Iwai
commit 18dd0aa5af
1 changed files with 4 additions and 0 deletions
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4
sound/core/control.c
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@ -436,6 +436,10 @@ static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file,
ret = -ENOENT;
goto error;
}
if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) {
ret = -EINVAL;
goto error;
}
for (idx = 0; idx < kctl->count; idx++)
if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) {
ret = -EBUSY;