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authorClemens Ladisch <clemens@ladisch.de>2009-08-17 12:28:09 +0200
committerTakashi Iwai <tiwai@suse.de>2009-08-17 12:48:21 +0200
commit18dd0aa5afea7dc33953aa87de696e39074bbf78 (patch)
tree59c3304f340c8ba180002c99c8961b388bf84fb0 /sound/core
parentf217ac59b6dd73105abc13da3fe656391fa6d135 (diff)
sound: snd_ctl_remove_user_ctl: prevent removal of kernel controls
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 <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/control.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/core/control.c b/sound/core/control.c
index bc64b723415b..a8b7fabe645e 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -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;