ASoC: ab8500-codec: info leak in anc_status_control_put()

If the user passes an invalid value it leads to an info leak when we
print the error message or it could oops.  This is called with user
supplied data from snd_ctl_elem_write().

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Cc: stable@vger.kernel.org

sound/soc/codecs/ab8500-codec.c

@@ -1225,13 +1225,18 @@ static int anc_status_control_put(struct snd_kcontrol *kcontrol,
 	struct ab8500_codec_drvdata *drvdata = dev_get_drvdata(codec->dev);
 	struct device *dev = codec->dev;
 	bool apply_fir, apply_iir;
-	int req, status;
+	unsigned int req;
+	int status;
 
 	dev_dbg(dev, "%s: Enter.\n", __func__);
 
 	mutex_lock(&drvdata->anc_lock);
 
 	req = ucontrol->value.integer.value[0];
+	if (req >= ARRAY_SIZE(enum_anc_state)) {
+		status = -EINVAL;
+		goto cleanup;
+	}
 	if (req != ANC_APPLY_FIR_IIR && req != ANC_APPLY_FIR &&
 		req != ANC_APPLY_IIR) {
 		dev_err(dev, "%s: ERROR: Unsupported status to set '%s'!\n",