[ALSA] powermac - Check value range in ctl callbacks

Check the value ranges in ctl put callbacks properly in snd-powermac
driver.

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

1 files changed, 5 insertions, 2 deletions

diff --git a/sound/ppc/beep.c b/sound/ppc/beep.c
index 566b5ab9d4e8..465dd0466b9f 100644
--- a/sound/ppc/beep.c
+++ b/sound/ppc/beep.c
@@ -195,10 +195,13 @@ static int snd_pmac_put_beep(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_value *ucontrol)
 {
         struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
-        int oval;
+        unsigned int oval, nval;
         snd_assert(chip->beep, return -ENXIO);
         oval = chip->beep->volume;
-        chip->beep->volume = ucontrol->value.integer.value[0];
+        nval = ucontrol->value.integer.value[0];
+        if (nval > 100)
+                return -EINVAL;
+        chip->beep->volume = nval;
         return oval != chip->beep->volume;
 }