[ALSA] emu10k1: Add mixer controls parameter checking.

Signed-off-by: James Courtier-Dutton <James@superbug.co.uk>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

sound/pci/emu10k1/emumixer.c

@@ -58,6 +58,9 @@ static int snd_emu10k1_spdif_get(struct snd_kcontrol *kcontrol,
 	unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
 	unsigned long flags;
 
+	/* Limit: emu->spdif_bits */
+	if (idx >= 3)
+		return -EINVAL;
 	spin_lock_irqsave(&emu->reg_lock, flags);
 	ucontrol->value.iec958.status[0] = (emu->spdif_bits[idx] >> 0) & 0xff;
 	ucontrol->value.iec958.status[1] = (emu->spdif_bits[idx] >> 8) & 0xff;
@@ -272,9 +275,12 @@ static int snd_emu1010_output_source_get(struct snd_kcontrol *kcontrol,
                                  struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
-	int channel;
+	unsigned int channel;
 
 	channel = (kcontrol->private_value) & 0xff;
+	/* Limit: emu1010_output_dst, emu->emu1010.output_source */
+	if (channel >= 24)
+		return -EINVAL;
 	ucontrol->value.enumerated.item[0] = emu->emu1010.output_source[channel];
 	return 0;
 }
@@ -285,9 +291,12 @@ static int snd_emu1010_output_source_put(struct snd_kcontrol *kcontrol,
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
 	int change = 0;
 	unsigned int val;
-	int channel;
+	unsigned int channel;
 
 	channel = (kcontrol->private_value) & 0xff;
+	/* Limit: emu1010_output_dst, emu->emu1010.output_source */
+	if (channel >= 24)
+		return -EINVAL;
 	if (emu->emu1010.output_source[channel] != ucontrol->value.enumerated.item[0]) {
 		val = emu->emu1010.output_source[channel] = ucontrol->value.enumerated.item[0];
 		change = 1;
@@ -301,9 +310,12 @@ static int snd_emu1010_input_source_get(struct snd_kcontrol *kcontrol,
                                  struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
-	int channel;
+	unsigned int channel;
 
 	channel = (kcontrol->private_value) & 0xff;
+	/* Limit: emu1010_input_dst, emu->emu1010.input_source */
+	if (channel >= 22)
+		return -EINVAL;
 	ucontrol->value.enumerated.item[0] = emu->emu1010.input_source[channel];
 	return 0;
 }
@@ -314,9 +326,12 @@ static int snd_emu1010_input_source_put(struct snd_kcontrol *kcontrol,
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
 	int change = 0;
 	unsigned int val;
-	int channel;
+	unsigned int channel;
 
 	channel = (kcontrol->private_value) & 0xff;
+	/* Limit: emu1010_input_dst, emu->emu1010.input_source */
+	if (channel >= 22)
+		return -EINVAL;
 	if (emu->emu1010.input_source[channel] != ucontrol->value.enumerated.item[0]) {
 		val = emu->emu1010.input_source[channel] = ucontrol->value.enumerated.item[0];
 		change = 1;
@@ -533,6 +548,9 @@ static int snd_emu1010_internal_clock_put(struct snd_kcontrol *kcontrol,
 	int change = 0;
 
 	val = ucontrol->value.enumerated.item[0] ;
+	/* Limit: uinfo->value.enumerated.items = 4; */
+	if (val >= 4)
+		return -EINVAL;
 	change = (emu->emu1010.internal_clock != val);
 	if (change) {
 		emu->emu1010.internal_clock = val;
@@ -669,7 +687,11 @@ static int snd_audigy_i2c_capture_source_put(struct snd_kcontrol *kcontrol,
 	 * update the capture volume from the cached value
 	 * for the particular source.
 	 */
-	source_id = ucontrol->value.enumerated.item[0]; /* Use 2 and 3 */
+	source_id = ucontrol->value.enumerated.item[0];
+	/* Limit: uinfo->value.enumerated.items = 2; */
+	/*        emu->i2c_capture_volume */
+	if (source_id >= 2)
+		return -EINVAL;
 	change = (emu->i2c_capture_source != source_id);
 	if (change) {
 		snd_emu10k1_i2c_write(emu, ADC_MUX, 0); /* Mute input */
@@ -720,9 +742,13 @@ static int snd_audigy_i2c_volume_get(struct snd_kcontrol *kcontrol,
 				 struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
-	int source_id;
+	unsigned int source_id;
 
 	source_id = kcontrol->private_value;
+	/* Limit: emu->i2c_capture_volume */
+        /*        capture_source: uinfo->value.enumerated.items = 2 */
+	if (source_id >= 2)
+		return -EINVAL;
 
 	ucontrol->value.integer.value[0] = emu->i2c_capture_volume[source_id][0];
 	ucontrol->value.integer.value[1] = emu->i2c_capture_volume[source_id][1];
@@ -735,10 +761,14 @@ static int snd_audigy_i2c_volume_put(struct snd_kcontrol *kcontrol,
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
 	unsigned int ogain;
 	unsigned int ngain;
-	int source_id;
+	unsigned int source_id;
 	int change = 0;
 
 	source_id = kcontrol->private_value;
+	/* Limit: emu->i2c_capture_volume */
+        /*        capture_source: uinfo->value.enumerated.items = 2 */
+	if (source_id >= 2)
+		return -EINVAL;
 	ogain = emu->i2c_capture_volume[source_id][0]; /* Left */
 	ngain = ucontrol->value.integer.value[0];
 	if (ngain > 0xff)
@@ -746,7 +776,7 @@ static int snd_audigy_i2c_volume_put(struct snd_kcontrol *kcontrol,
 	if (ogain != ngain) {
 		if (emu->i2c_capture_source == source_id)
 			snd_emu10k1_i2c_write(emu, ADC_ATTEN_ADCL, ((ngain) & 0xff) );
-		emu->i2c_capture_volume[source_id][0] = ucontrol->value.integer.value[0];
+		emu->i2c_capture_volume[source_id][0] = ngain;
 		change = 1;
 	}
 	ogain = emu->i2c_capture_volume[source_id][1]; /* Right */
@@ -756,7 +786,7 @@ static int snd_audigy_i2c_volume_put(struct snd_kcontrol *kcontrol,
 	if (ogain != ngain) {
 		if (emu->i2c_capture_source == source_id)
 			snd_emu10k1_i2c_write(emu, ADC_ATTEN_ADCR, ((ngain) & 0xff));
-		emu->i2c_capture_volume[source_id][1] = ucontrol->value.integer.value[1];
+		emu->i2c_capture_volume[source_id][1] = ngain;
 		change = 1;
 	}
 
@@ -877,6 +907,9 @@ static int snd_emu10k1_spdif_put(struct snd_kcontrol *kcontrol,
 	unsigned int val;
 	unsigned long flags;
 
+	/* Limit: emu->spdif_bits */
+	if (idx >= 3)
+		return -EINVAL;
 	val = (ucontrol->value.iec958.status[0] << 0) |
 	      (ucontrol->value.iec958.status[1] << 8) |
 	      (ucontrol->value.iec958.status[2] << 16) |
@@ -1050,6 +1083,7 @@ static int snd_emu10k1_send_volume_put(struct snd_kcontrol *kcontrol,
 {
 	unsigned long flags;
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
+	/* FIXME: Check limits */
 	struct snd_emu10k1_pcm_mixer *mix =
 		&emu->pcm_mixer[snd_ctl_get_ioffidx(kcontrol, &ucontrol->id)];
 	int change = 0, idx, val;
@@ -1102,6 +1136,7 @@ static int snd_emu10k1_attn_get(struct snd_kcontrol *kcontrol,
                                 struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
+	/* FIXME: Check limits */
 	struct snd_emu10k1_pcm_mixer *mix =
 		&emu->pcm_mixer[snd_ctl_get_ioffidx(kcontrol, &ucontrol->id)];
 	unsigned long flags;
@@ -1119,6 +1154,7 @@ static int snd_emu10k1_attn_put(struct snd_kcontrol *kcontrol,
 {
 	unsigned long flags;
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
+	/* FIXME: Check limits */
 	struct snd_emu10k1_pcm_mixer *mix =
 		&emu->pcm_mixer[snd_ctl_get_ioffidx(kcontrol, &ucontrol->id)];
 	int change = 0, idx, val;
@@ -1171,6 +1207,7 @@ static int snd_emu10k1_efx_send_routing_get(struct snd_kcontrol *kcontrol,
 {
 	unsigned long flags;
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
+	/* FIXME: Check limits */
 	struct snd_emu10k1_pcm_mixer *mix =
 		&emu->efx_pcm_mixer[snd_ctl_get_ioffidx(kcontrol, &ucontrol->id)];
 	int idx;
@@ -1190,6 +1227,7 @@ static int snd_emu10k1_efx_send_routing_put(struct snd_kcontrol *kcontrol,
 {
 	unsigned long flags;
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
+	/* FIXME: Check limits */
 	int ch = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
 	struct snd_emu10k1_pcm_mixer *mix = &emu->efx_pcm_mixer[ch];
 	int change = 0, idx, val;
@@ -1241,6 +1279,7 @@ static int snd_emu10k1_efx_send_volume_get(struct snd_kcontrol *kcontrol,
 {
 	unsigned long flags;
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
+	/* FIXME: Check limits */
 	struct snd_emu10k1_pcm_mixer *mix =
 		&emu->efx_pcm_mixer[snd_ctl_get_ioffidx(kcontrol, &ucontrol->id)];
 	int idx;
@@ -1258,6 +1297,7 @@ static int snd_emu10k1_efx_send_volume_put(struct snd_kcontrol *kcontrol,
 {
 	unsigned long flags;
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
+	/* FIXME: Check limits */
 	int ch = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
 	struct snd_emu10k1_pcm_mixer *mix = &emu->efx_pcm_mixer[ch];
 	int change = 0, idx, val;
@@ -1306,6 +1346,7 @@ static int snd_emu10k1_efx_attn_get(struct snd_kcontrol *kcontrol,
                                 struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
+	/* FIXME: Check limits */
 	struct snd_emu10k1_pcm_mixer *mix =
 		&emu->efx_pcm_mixer[snd_ctl_get_ioffidx(kcontrol, &ucontrol->id)];
 	unsigned long flags;
@@ -1321,6 +1362,7 @@ static int snd_emu10k1_efx_attn_put(struct snd_kcontrol *kcontrol,
 {
 	unsigned long flags;
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
+	/* FIXME: Check limits */
 	int ch = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
 	struct snd_emu10k1_pcm_mixer *mix = &emu->efx_pcm_mixer[ch];
 	int change = 0, val;