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ALSA: hda - check NULL pointer when creating SPDIF PCM switch

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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>
This commit is contained in:
Mengdong Lin 2013-03-07 14:11:05 -05:00 committed by Takashi Iwai
parent 25336e8ae2
commit 4c7a548a70
1 changed files with 7 additions and 2 deletions
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9
sound/pci/hda/hda_codec.c
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@ -3433,11 +3433,16 @@ static struct snd_kcontrol_new spdif_share_sw = {
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);