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ALSA: hda - Fix NULL dereference with CONFIG_SND_DYNAMIC_MINORS=n

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commit 2ca320e294 upstream.

Without the dynamic minor assignment, HDMI codec may have less PCM
instances than the number of pins, which eventually leads to Oops.

Reported-by: Stratos Karafotis <stratosk@semaphore.gr>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai
2013-08-22 09:55:36 +02:00
committed by Greg Kroah-Hartman
parent 192caed2bf
commit da958137df
1 changed files with 3 additions and 0 deletions
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3
sound/pci/hda/patch_hdmi.c
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@@ -1715,6 +1715,9 @@ static int generic_hdmi_build_controls(struct hda_codec *codec)
struct snd_pcm_chmap *chmap;
struct snd_kcontrol *kctl;
int i;
if (!codec->pcm_info[pin_idx].pcm)
break;
err = snd_pcm_add_chmap_ctls(codec->pcm_info[pin_idx].pcm,
SNDRV_PCM_STREAM_PLAYBACK,
NULL, 0, pin_idx, &chmap);