diff --git a/plugins/VOIP/services/rsVOIPItems.cc b/plugins/VOIP/services/rsVOIPItems.cc
index afc76b505..9ba20868e 100644
--- a/plugins/VOIP/services/rsVOIPItems.cc
+++ b/plugins/VOIP/services/rsVOIPItems.cc
@@ -447,6 +447,9 @@ RsVOIPDataItem::RsVOIPDataItem(void *data, uint32_t pktsize)
 	ok &= getRawUInt32(data, rssize, &offset, &flags);
 	ok &= getRawUInt32(data, rssize, &offset, &data_size);
 
+    	if(data_size > rssize || rssize - data_size < offset)
+            throw std::runtime_error("Not enough space.") ;
+        
 	voip_data = malloc(data_size) ;
 	memcpy(voip_data,&((uint8_t*)data)[offset],data_size) ;
 	offset += data_size ;