fix use_buffers checks

We can set 0 buffers even if there is no format.
Return -ENOSPC when too many buffers are set.

spa/plugins/alsa/alsa-pcm-sink.c

@@ -731,6 +731,7 @@ impl_node_port_use_buffers(void *object,
 {
 	struct state *this = object;
 	uint32_t i;
+	int res;
 
 	spa_return_val_if_fail(this != NULL, -EINVAL);
 
@@ -738,14 +739,15 @@ impl_node_port_use_buffers(void *object,
 
 	spa_log_debug(this->log, "%p: use %d buffers", this, n_buffers);
 
-	if (!this->have_format)
-		return -EIO;
-
-	if (n_buffers == 0) {
+	if (this->n_buffers > 0) {
 		spa_alsa_pause(this);
-		clear_buffers(this);
-		return 0;
+		if ((res = clear_buffers(this)) < 0)
+			return res;
 	}
+	if (n_buffers > 0 && !this->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
 
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b = &this->buffers[i];

spa/plugins/alsa/alsa-pcm-source.c

@@ -673,9 +673,6 @@ impl_node_port_use_buffers(void *object,
 
 	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
 
-	if (!this->have_format)
-		return -EIO;
-
 	spa_log_debug(this->log, "%p: use %d buffers", this, n_buffers);
 
 	if (this->n_buffers > 0) {
@@ -683,6 +680,11 @@ impl_node_port_use_buffers(void *object,
 		if ((res = clear_buffers(this)) < 0)
 			return res;
 	}
+	if (n_buffers > 0 && !this->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b = &this->buffers[i];
 		struct spa_data *d = buffers[i]->datas;

spa/plugins/alsa/alsa-seq-bridge.c

@@ -748,11 +748,13 @@ impl_node_port_use_buffers(void *object,
 	spa_log_debug(this->log, "%p: port %d.%d buffers:%d format:%d", this,
 			direction, port_id, n_buffers, port->have_format);
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b = &port->buffers[i];
 		struct spa_data *d = buffers[i]->datas;

spa/plugins/audioconvert/audioconvert.c

@@ -2049,13 +2049,16 @@ impl_node_port_use_buffers(void *object,
 
 	port = GET_PORT(this, direction, port_id);
 
-	spa_return_val_if_fail(port->have_format, -EIO);
-
 	spa_log_debug(this->log, "%p: use buffers %d on port %d:%d",
 			this, n_buffers, direction, port_id);
 
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	maxsize = this->quantum_limit * sizeof(float);
 
 	for (i = 0; i < n_buffers; i++) {

spa/plugins/audiomixer/audiomixer.c

@@ -649,10 +649,13 @@ impl_node_port_use_buffers(void *object,
 
 	port = GET_PORT(this, direction, port_id);
 
-	spa_return_val_if_fail(port->have_format, -EIO);
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b;
 		struct spa_data *d = buffers[i]->datas;

spa/plugins/audiomixer/mixer-dsp.c

@@ -586,10 +586,13 @@ impl_node_port_use_buffers(void *object,
 
 	port = GET_PORT(this, direction, port_id);
 
-	spa_return_val_if_fail(port->have_format, -EIO);
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b;
 		struct spa_data *d = buffers[i]->datas;

spa/plugins/audiotestsrc/audiotestsrc.c

@@ -829,11 +829,13 @@ impl_node_port_use_buffers(void *object,
 
 	port = &this->port;
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b;
 		struct spa_data *d = buffers[i]->datas;

spa/plugins/avb/avb-pcm-sink.c

@@ -629,14 +629,14 @@ impl_node_port_use_buffers(void *object,
 
 	spa_log_debug(this->log, "%p: use %d buffers", this, n_buffers);
 
-	if (!port->have_format)
-		return -EIO;
-
-	if (n_buffers == 0) {
+	if (port->n_buffers > 0) {
 		spa_avb_pause(this);
 		clear_buffers(this, port);
-		return 0;
 	}
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
 
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b = &port->buffers[i];

spa/plugins/avb/avb-pcm-source.c

@@ -629,14 +629,14 @@ impl_node_port_use_buffers(void *object,
 
 	spa_log_debug(this->log, "%p: use %d buffers", this, n_buffers);
 
-	if (!port->have_format)
-		return -EIO;
-
-	if (n_buffers == 0) {
+	if (port->n_buffers > 0) {
 		spa_avb_pause(this);
 		clear_buffers(this, port);
-		return 0;
 	}
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
 
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b = &port->buffers[i];

spa/plugins/bluez5/media-sink.c

@@ -1453,11 +1453,13 @@ impl_node_port_use_buffers(void *object,
 
 	spa_log_debug(this->log, "use buffers %d", n_buffers);
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b = &port->buffers[i];
 

spa/plugins/bluez5/media-source.c

@@ -1202,11 +1202,13 @@ impl_node_port_use_buffers(void *object,
 
 	spa_log_debug(this->log, "use buffers %d", n_buffers);
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b = &port->buffers[i];
 		struct spa_data *d = buffers[i]->datas;

spa/plugins/bluez5/sco-sink.c

@@ -1186,11 +1186,13 @@ impl_node_port_use_buffers(void *object,
 
 	spa_log_debug(this->log, "use buffers %d", n_buffers);
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b = &port->buffers[i];
 

spa/plugins/bluez5/sco-source.c

@@ -1155,11 +1155,13 @@ impl_node_port_use_buffers(void *object,
 
 	spa_log_debug(this->log, "use buffers %d", n_buffers);
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b = &port->buffers[i];
 		struct spa_data *d = buffers[i]->datas;

spa/plugins/control/mixer.c

@@ -506,10 +506,13 @@ impl_node_port_use_buffers(void *object,
 	spa_log_debug(this->log, NAME " %p: use buffers %d on port %d:%d",
 			this, n_buffers, direction, port_id);
 
-	spa_return_val_if_fail(port->have_format, -EIO);
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b;
 		struct spa_data *d = buffers[i]->datas;

spa/plugins/jack/jack-sink.c

@@ -693,11 +693,13 @@ impl_node_port_use_buffers(void *object,
 
 	port = GET_PORT(this, direction, port_id);
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b;
 

spa/plugins/jack/jack-source.c

@@ -693,11 +693,13 @@ impl_node_port_use_buffers(void *object,
 
 	port = GET_PORT(this, direction, port_id);
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b;
 

spa/plugins/libcamera/libcamera-source.cpp

@@ -774,14 +774,15 @@ static int impl_node_port_use_buffers(void *object,
 
 	port = GET_PORT(impl, direction, port_id);
 
-	if (!port->current_format)
-		return -EIO;
-
 	if (port->n_buffers) {
 		spa_libcamera_stream_off(impl);
 		if ((res = spa_libcamera_clear_buffers(impl, port)) < 0)
 			return res;
 	}
+	if (n_buffers > 0 && !port->current_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
 	if (buffers == NULL)
 		return 0;
 

spa/plugins/support/null-audio-sink.c

@@ -685,11 +685,13 @@ impl_node_port_use_buffers(void *object,
 
 	port = &this->port;
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b;
 		struct spa_data *d = buffers[i]->datas;

spa/plugins/test/fakesink.c

@@ -585,11 +585,13 @@ impl_node_port_use_buffers(void *object,
 	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
 	port = &this->port;
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b;
 		struct spa_data *d = buffers[i]->datas;

spa/plugins/test/fakesrc.c

@@ -597,11 +597,13 @@ impl_node_port_use_buffers(void *object,
 	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
 	port = &this->port;
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b;
 		struct spa_data *d = buffers[i]->datas;

spa/plugins/v4l2/v4l2-source.c

@@ -756,14 +756,15 @@ static int impl_node_port_use_buffers(void *object,
 
 	port = GET_PORT(this, direction, port_id);
 
-	if (!port->have_format)
-		return -EIO;
-
 	if (port->n_buffers) {
 		spa_v4l2_stream_off(this);
 		if ((res = spa_v4l2_clear_buffers(this)) < 0)
 			return res;
 	}
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
 	if (buffers == NULL)
 		return 0;
 

spa/plugins/videotestsrc/videotestsrc.c

@@ -712,11 +712,13 @@ impl_node_port_use_buffers(void *object,
 	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
 	port = &this->port;
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b;
 		struct spa_data *d = buffers[i]->datas;

spa/plugins/volume/volume.c

@@ -528,11 +528,13 @@ impl_node_port_use_buffers(void *object,
 
 	port = GET_PORT(this, direction, port_id);
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b;
 		struct spa_data *d = buffers[i]->datas;

spa/plugins/vulkan/vulkan-compute-filter.c

@@ -505,11 +505,13 @@ impl_node_port_use_buffers(void *object,
 	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
 	port = &this->port[direction];
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b;
 

spa/plugins/vulkan/vulkan-compute-source.c

@@ -740,11 +740,13 @@ impl_node_port_use_buffers(void *object,
 	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
 	port = &this->port;
 
-	if (!port->have_format)
-		return -EIO;
-
 	clear_buffers(this, port);
 
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
 	for (i = 0; i < n_buffers; i++) {
 		struct buffer *b;