sound: oxygen: fix NULL pointer dereference when loading snd-oxygen
Check that model->control_filter is set before trying to call it.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/oxygen/oxygen_mixer.c b/sound/pci/oxygen/oxygen_mixer.c
index cc0cdda..6facac5 100644
--- a/sound/pci/oxygen/oxygen_mixer.c
+++ b/sound/pci/oxygen/oxygen_mixer.c
@@ -936,11 +936,13 @@
for (i = 0; i < count; ++i) {
template = controls[i];
- err = chip->model->control_filter(&template);
- if (err < 0)
- return err;
- if (err == 1)
- continue;
+ if (chip->model->control_filter) {
+ err = chip->model->control_filter(&template);
+ if (err < 0)
+ return err;
+ if (err == 1)
+ continue;
+ }
if (!strcmp(template.name, "Master Playback Volume") &&
chip->model->dac_tlv) {
template.tlv.p = chip->model->dac_tlv;