From: Mengdong Lin Date: Thu, 7 Mar 2013 19:11:05 +0000 (-0500) Subject: ALSA: hda - check NULL pointer when creating SPDIF PCM switch X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4c7a548a70a44269266858f65c3b5fc9c3ace057;p=linux-beck.git 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 Signed-off-by: Takashi Iwai --- diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c index 3dc656688c08..97c68dd24ef5 100644 --- a/sound/pci/hda/hda_codec.c +++ b/sound/pci/hda/hda_codec.c @@ -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);