ASoC: max98090: Move check for invalid values before casting in max98090_put_enab_tlv()

Validation of signed input should be done before casting to unsigned int.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Suggested-by: Mark Brown <broonie@kernel.org>
Fixes: 2fbe467bcbfc ("ASoC: max98090: Reject invalid values in custom control put()")
Link: https://lore.kernel.org/r/1652999486-29653-1-git-send-email-khoroshilov@ispras.ru
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c
index 48dcf07..576277a 100644 (file)
--- a/sound/soc/codecs/max98090.c
+++ b/sound/soc/codecs/max98090.c
@@ -393,7 +393,8 @@ static int max98090_put_enab_tlv(struct snd_kcontrol *kcontrol,
        struct soc_mixer_control *mc =
                (struct soc_mixer_control *)kcontrol->private_value;
        unsigned int mask = (1 << fls(mc->max)) - 1;
-       unsigned int sel = ucontrol->value.integer.value[0];
+       int sel_unchecked = ucontrol->value.integer.value[0];
+       unsigned int sel;
        unsigned int val = snd_soc_component_read(component, mc->reg);
        unsigned int *select;
        int change;
@@ -414,8 +415,9 @@ static int max98090_put_enab_tlv(struct snd_kcontrol *kcontrol,
 
        val = (val >> mc->shift) & mask;
 
-       if (sel < 0 || sel > mc->max)
+       if (sel_unchecked < 0 || sel_unchecked > mc->max)
                return -EINVAL;
+       sel = sel_unchecked;
 
        change = *select != sel;
        *select = sel;