ASoC: ops: Shift tested values in snd_soc_put_volsw() by +min

While the $val/$val2 values passed in from userspace are always >= 0
integers, the limits of the control can be signed integers and the $min
can be non-zero and less than zero. To correctly validate $val/$val2
against platform_max, add the $min offset to val first.

Fixes: 817f7c9335ec0 ("ASoC: ops: Reject out of bounds values in snd_soc_put_volsw()")
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20220215130645.164025-1-marex@denx.de
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/soc-ops.c b/sound/soc/soc-ops.c
index 03ea959..a0ca58b 100644 (file)
--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -319,7 +319,7 @@ int snd_soc_put_volsw(struct snd_kcontrol *kcontrol,
        if (ucontrol->value.integer.value[0] < 0)
                return -EINVAL;
        val = ucontrol->value.integer.value[0];
-       if (mc->platform_max && val > mc->platform_max)
+       if (mc->platform_max && ((int)val + min) > mc->platform_max)
                return -EINVAL;
        if (val > max - min)
                return -EINVAL;
@@ -332,7 +332,7 @@ int snd_soc_put_volsw(struct snd_kcontrol *kcontrol,
                if (ucontrol->value.integer.value[1] < 0)
                        return -EINVAL;
                val2 = ucontrol->value.integer.value[1];
-               if (mc->platform_max && val2 > mc->platform_max)
+               if (mc->platform_max && ((int)val2 + min) > mc->platform_max)
                        return -EINVAL;
                if (val2 > max - min)
                        return -EINVAL;