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: 817f7c9 ("ASoC: ops: Reject out of bounds values in snd_soc_put_volsw()")
Signed-off-by: Marek Vasut <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: Marek Vasut

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;