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ASoC: max9759: fix underflow in speaker_gain_control_put()

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Check for negative values of "priv->gain" to prevent an out of bounds
access.  The concern is that these might come from the user via:
  -> snd_ctl_elem_write_user()
    -> snd_ctl_elem_write()
      -> kctl->put()

Fixes: fa8d915172 ("ASoC: max9759: Add Amplifier Driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220119123101.GA9509@kili
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Dan Carpenter 2022-01-19 15:31:01 +03:00 committed by Mark Brown
parent f7a6021aaf
commit 4c907bcd9d
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1 changed files with 2 additions and 1 deletions
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sound/soc/codecs/max9759.c
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@ -64,7 +64,8 @@ static int speaker_gain_control_put(struct snd_kcontrol *kcontrol,
struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
struct max9759 *priv = snd_soc_component_get_drvdata(c);
if (ucontrol->value.integer.value[0] > 3)
if (ucontrol->value.integer.value[0] < 0 ||
ucontrol->value.integer.value[0] > 3)
return -EINVAL;
priv->gain = ucontrol->value.integer.value[0];