diff --git a/include/villas/hook.hpp b/include/villas/hook.hpp
index 943f92983..27bd280c8 100644
--- a/include/villas/hook.hpp
+++ b/include/villas/hook.hpp
@@ -180,7 +180,10 @@ protected:
 	std::string signalName;
 
 public:
-	using Hook::Hook;
+	SingleSignalHook(struct vpath *p, struct vnode *n, int fl, int prio, bool en = true) :
+		Hook(p, n, fl, prio, en),
+		signalIndex(0)
+	{ }
 
 	virtual
 	void parse(json_t *json);
diff --git a/include/villas/node_type.h b/include/villas/node_type.h
index 41bd45d7e..2d89da9f7 100644
--- a/include/villas/node_type.h
+++ b/include/villas/node_type.h
@@ -62,7 +62,6 @@ struct vnode_type {
 	villas::node::NodeList instances;	/**< A list of all existing nodes of this type. */
 
 	size_t size;				/**< Size of private data bock. @see node::_vd */
-	size_t pool_size;
 
 	struct {
 		/** Global initialization per node type.
diff --git a/lib/hooks/dp.cpp b/lib/hooks/dp.cpp
index 09a7bf7e3..60097c234 100644
--- a/lib/hooks/dp.cpp
+++ b/lib/hooks/dp.cpp
@@ -105,6 +105,7 @@ protected:
 		/* Reconstruct the original signal */
 		for (int k = 0; k < fharmonics_len; k++) {
 			double freq = fharmonics[k];
+			// cppcheck-suppress objectIndex
 			std::complex<double> coeff = in[k];
 			std::complex<double> om = 2.0i * M_PI * freq * time;
 
@@ -296,7 +297,7 @@ public:
 
 	virtual Hook::Reason process(sample *smp)
 	{
-		if (signal_index > smp->length)
+		if (signal_index >= smp->length)
 			return Hook::Reason::ERROR;
 
 		if (inverse) {
diff --git a/lib/nodes/influxdb.cpp b/lib/nodes/influxdb.cpp
index 8f6f4cfbc..8ffc7edb7 100644
--- a/lib/nodes/influxdb.cpp
+++ b/lib/nodes/influxdb.cpp
@@ -124,10 +124,10 @@ int influxdb_close(struct vnode *n)
 int influxdb_write(struct vnode *n, struct sample * const smps[], unsigned cnt)
 {
 	struct influxdb *i = (struct influxdb *) n->_vd;
-
-	char *buf = nullptr;
 	ssize_t sentlen, buflen;
 
+	auto *buf = strf("");
+
 	for (unsigned k = 0; k < cnt; k++) {
 		const struct sample *smp = smps[k];
 
diff --git a/lib/nodes/temper.cpp b/lib/nodes/temper.cpp
index 88103fc70..374e49ea5 100644
--- a/lib/nodes/temper.cpp
+++ b/lib/nodes/temper.cpp
@@ -126,8 +126,7 @@ void TEMPerDevice::read(struct sample *smp)
 
 	smp->flags = 0;
 	smp->length = i;
-	if (smp->length > 0)
-		smp->flags |= (int) SampleFlags::HAS_DATA;
+	smp->flags |= (int) SampleFlags::HAS_DATA;
 }
 
 /* Thanks to https://github.com/edorfaus/TEMPered */
diff --git a/lib/path.cpp b/lib/path.cpp
index 250ce6860..42e944454 100644
--- a/lib/path.cpp
+++ b/lib/path.cpp
@@ -237,7 +237,7 @@ static int path_prepare_poll(struct vpath *p)
 int path_prepare(struct vpath *p, NodeList &nodes)
 {
 	int ret;
-	unsigned pool_size;
+	unsigned pool_size = 0;
 
 	struct memory_type *pool_mt = memory_default;
 
@@ -334,9 +334,6 @@ int path_prepare(struct vpath *p, NodeList &nodes)
 	for (size_t i = 0; i < vlist_length(&p->destinations); i++) {
 		auto *pd = (struct vpath_destination *) vlist_at(&p->destinations, i);
 
-		if (node_type(pd->node)->pool_size > pool_size)
-			pool_size = node_type(pd->node)->pool_size;
-
 		if (node_type(pd->node)->memory_type)
 			pool_mt = node_memory_type(pd->node);
 
diff --git a/lib/path_source.cpp b/lib/path_source.cpp
index 7ac60f5f8..bed33d62c 100644
--- a/lib/path_source.cpp
+++ b/lib/path_source.cpp
@@ -54,9 +54,6 @@ int path_source_init_master(struct vpath_source *ps, struct vnode *n)
 
 	int pool_size = MAX(DEFAULT_QUEUE_LENGTH, 20 * ps->node->in.vectorize);
 
-	if (node_type(ps->node)->pool_size)
-		pool_size = node_type(ps->node)->pool_size;
-
 	ret = pool_init(&ps->pool, pool_size, SAMPLE_LENGTH(node_input_signals_max_cnt(ps->node)), node_memory_type(ps->node));
 
 	if (ret)
diff --git a/lib/queue.cpp b/lib/queue.cpp
index 52636afcc..777816af8 100644
--- a/lib/queue.cpp
+++ b/lib/queue.cpp
@@ -163,7 +163,7 @@ int queue_push_many(struct queue *q, void *ptr[], size_t cnt)
 	int ret;
 	size_t i;
 
-	for (i = 0; i < cnt; i++) {
+	for (ret = 0, i = 0; i < cnt; i++) {
 		ret = queue_push(q, ptr[i]);
 		if (ret <= 0)
 			break;
@@ -180,7 +180,7 @@ int queue_pull_many(struct queue *q, void *ptr[], size_t cnt)
 	int ret;
 	size_t i;
 
-	for (i = 0; i < cnt; i++) {
+	for (ret = 0, i = 0; i < cnt; i++) {
 		ret = queue_pull(q, &ptr[i]);
 		if (ret <= 0)
 			break;