ALSA: hda - Fix NULL dereference with CONFIG_SND_DYNAMIC_MINORS=n
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>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 030ca86..9f35862 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1781,6 +1781,9 @@
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);