fix: throw error on invalid length

Author: anonrig

lib/internals/querystring.js

@@ -71,6 +71,13 @@ function encodeString(str) {
     // Surrogate pair
     ++i;
 
+    // This branch should never happen because all URLSearchParams entries
+    // should already be converted to USVString. But, included for
+    // completion's sake anyway.
+    if (i >= len) {
+      throw new Error("URI malformed");
+    }
+
     const c2 = str.charCodeAt(i) & 0x3FF;
 
     lastPos = i + 1;