ALSA: hda - check NULL pointer when creating SPDIF PCM switch
If the new control cannot be created, this function will return to avoid
snd_hda_ctl_add dereferencing a NULL control pointer.
Signed-off-by: Mengdong Lin <mengdong.lin@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 3dc6566..97c68dd 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -3433,11 +3433,16 @@
int snd_hda_create_spdif_share_sw(struct hda_codec *codec,
struct hda_multi_out *mout)
{
+ struct snd_kcontrol *kctl;
+
if (!mout->dig_out_nid)
return 0;
+
+ kctl = snd_ctl_new1(&spdif_share_sw, mout);
+ if (!kctl)
+ return -ENOMEM;
/* ATTENTION: here mout is passed as private_data, instead of codec */
- return snd_hda_ctl_add(codec, mout->dig_out_nid,
- snd_ctl_new1(&spdif_share_sw, mout));
+ return snd_hda_ctl_add(codec, mout->dig_out_nid, kctl);
}
EXPORT_SYMBOL_HDA(snd_hda_create_spdif_share_sw);
