ASoC: 88pm860x: array overflow in snd_soc_put_volsw_2r_st()

commit d967967e8d1116fb38bad25e58714b5dddd03cca upstream.

This is called from snd_ctl_elem_write() with user supplied data so we
need to add some bounds checking.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/sound/soc/codecs/88pm860x-codec.c b/sound/soc/codecs/88pm860x-codec.c
index 60159c07448d..6fd174be3bdf 100644
--- a/sound/soc/codecs/88pm860x-codec.c
+++ b/sound/soc/codecs/88pm860x-codec.c
@@ -351,6 +351,9 @@ static int snd_soc_put_volsw_2r_st(struct snd_kcontrol *kcontrol,
         val = ucontrol->value.integer.value[0];
         val2 = ucontrol->value.integer.value[1];
 
+        if (val >= ARRAY_SIZE(st_table) || val2 >= ARRAY_SIZE(st_table))
+                return -EINVAL;
+
         err = snd_soc_update_bits(codec, reg, 0x3f, st_table[val].m);
         if (err < 0)
                 return err;