fix(deserializer): corrected the check for (size + index) comparision to buffer.length

Author: JoelParke

lib/bson/parser/deserializer.js

@@ -23,7 +23,7 @@ var deserialize = function(buffer, options, isArray) {
   var size = buffer[index] | buffer[index+1] << 8 | buffer[index+2] << 16 | buffer[index+3] << 24;
 
 	// Ensure buffer is valid size
-  if(size < 5 || buffer.length < size || (size + index) < buffer.length) {
+  if(size < 5 || buffer.length < size || (size + index) > buffer.length) {
 		throw new Error("corrupt bson message");
 	}