ALSA: hda_codec: Check for invalid zero connections

To prevent "Too many connections" message and the error path for some HDMI
codecs (which makes onboard audio unusable), check for invalid zero
connections for CONNECT_LIST verb.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 26d255de6beb..88480c0c58a0 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -332,6 +332,12 @@ int snd_hda_get_connections(struct hda_codec *codec, hda_nid_t nid,
                                                   AC_VERB_GET_CONNECT_LIST, i);
                 range_val = !!(parm & (1 << (shift-1))); /* ranges */
                 val = parm & mask;
+                if (val == 0) {
+                        snd_printk(KERN_WARNING "hda_codec: "
+                                   "invalid CONNECT_LIST verb %x[%i]:%x\n",
+                                    nid, i, parm);
+                        return 0;
+                }
                 parm >>= shift;
                 if (range_val) {
                         /* ranges between the previous and this one */