ALSA - hda: hdmi check NULL pointer in hdmi_set_chmap

Make sure per_pin is not NULL before using it.

Fixes: 9b3dc8aa3fb1 ('ALSA: hda - Register chmap obj as priv data instead of codec')
Signed-off-by: Libin Yang <libin.yang@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index c83c1a8d9742..40933aa33afe 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1858,6 +1858,8 @@ static void hdmi_set_chmap(struct hdac_device *hdac, int pcm_idx,
         struct hdmi_spec *spec = codec->spec;
         struct hdmi_spec_per_pin *per_pin = pcm_idx_to_pin(spec, pcm_idx);
 
+        if (!per_pin)
+                return;
         mutex_lock(&per_pin->lock);
         per_pin->chmap_set = true;
         memcpy(per_pin->chmap, chmap, ARRAY_SIZE(per_pin->chmap));