diff --git a/src/wps/ndef.c b/src/wps/ndef.c
index bb3c055..63f0d52 100644
--- a/src/wps/ndef.c
+++ b/src/wps/ndef.c
@@ -63,12 +63,18 @@
 	} else
 		record->id_length = 0;
 
+	if (record->type_length > data + size - pos)
+		return -1;
 	record->type = record->type_length == 0 ? NULL : pos;
 	pos += record->type_length;
 
+	if (record->id_length > data + size - pos)
+		return -1;
 	record->id = record->id_length == 0 ? NULL : pos;
 	pos += record->id_length;
 
+	if (record->payload_length > (size_t) (data + size - pos))
+		return -1;
 	record->payload = record->payload_length == 0 ? NULL : pos;
 	pos += record->payload_length;