ALSA: asihpi - Fix potential Oops in snd_asihpi_cmode_info()

Dan Carpenter reported that setting 0 to uinfo->value.enumerated.items
in snd_asihpi_cmode_info() may lead to Oops.  This function should
return an error immediately in such a case instead.

Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/sound/pci/asihpi/asihpi.c b/sound/pci/asihpi/asihpi.c
index fd3926fb0a08..e8de831f98bc 100644
--- a/sound/pci/asihpi/asihpi.c
+++ b/sound/pci/asihpi/asihpi.c
@@ -2259,6 +2259,9 @@ static int snd_asihpi_cmode_info(struct snd_kcontrol *kcontrol,
                         valid_modes++;
                         }
 
+        if (!valid_modes)
+                return -EINVAL;
+
         uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
         uinfo->count = 1;
         uinfo->value.enumerated.items = valid_modes;