diff --git a/src/modules/module-netjack2/peer.c b/src/modules/module-netjack2/peer.c
index 548daa4d0..bec71fe0d 100644
--- a/src/modules/module-netjack2/peer.c
+++ b/src/modules/module-netjack2/peer.c
@@ -824,7 +824,7 @@ static int netjack2_recv_float(struct netjack2_peer *peer, struct nj2_packet_hea
 		return -errno;
 
 	active_ports = ntohl(header->active_ports);
-	if (active_ports == 0)
+	if (active_ports == 0 || active_ports > MAX_CHANNELS)
 		return 0;
 
 	uint32_t max_size = PACKET_AVAILABLE_SIZE(peer->params.mtu);
@@ -833,11 +833,11 @@ static int netjack2_recv_float(struct netjack2_peer *peer, struct nj2_packet_hea
 	sub_period_size = SPA_MIN(period, (uint32_t)peer->sync.frames);
 	sub_period_bytes = sub_period_size * sizeof(float) + sizeof(int32_t);
 
-	if ((size_t)len < active_ports * sub_period_bytes + sizeof(*header))
+	if ((size_t)len < (size_t)active_ports * sub_period_bytes + sizeof(*header))
 		return 0;
 
 	sub_cycle = ntohl(header->sub_cycle);
-	if (sub_cycle * sub_period_size > peer->quantum_limit)
+	if (sub_period_size == 0 || sub_cycle > peer->quantum_limit / sub_period_size)
 		return 0;
 
 	for (i = 0; i < active_ports; i++) {