diff --git a/DMRNetwork.cpp b/DMRNetwork.cpp
index 8e96acd..cf110c6 100644
--- a/DMRNetwork.cpp
+++ b/DMRNetwork.cpp
@@ -252,6 +252,9 @@ bool CDMRNetwork::writeRadioPosition(const unsigned char* data, unsigned int len
 	if (!m_location)
 		return false;
 
+	if (length < 4U || length > 50U)
+		return false;
+
 	unsigned char buffer[50U];
 
 	::memcpy(buffer + 0U, "DMRG", 4U);
@@ -268,6 +271,9 @@ bool CDMRNetwork::writeTalkerAlias(const unsigned char* data, unsigned int lengt
 	if (m_status != STATUS::RUNNING)
 		return false;
 
+	if (length < 4U || length > 50U)
+		return false;
+
 	unsigned char buffer[50U];
 
 	::memcpy(buffer + 0U, "DMRA", 4U);