Disallow negative size values in BinaryBlob

desktop_version/src/BinaryBlob.cpp

@@ -105,6 +105,10 @@ bool binaryBlob::unPackBinary(const char* name)
 		{
 			continue; /* Must be EXACTLY 1 or 0 */
 		}
+		if (size < 1)
+		{
+			continue; /* Must be nonzero and positive */
+		}
 		if ((offset + m_headers[i].size) > size)
 		{
 			continue; /* Bogus size value */