fs: fix stack overflow in fs.readdirSync

Previously, fs.readdirSync calls the function returned by
env->push_values_to_array_function() in batch and check the returned
Maybe right away in C++, which can lead to assertions if the call stack
already reaches the maximum size. This patch fixes that by returning
early the call fails so the stack overflow error will be properly
thrown into JS land.

PR-URL: nodejs#18647
Fixes: nodejs#18645
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: joyeecheung

src/node_file.cc

@@ -1132,14 +1132,20 @@ static void ReadDir(const FunctionCallbackInfo<Value>& args) {
       name_v[name_idx++] = filename.ToLocalChecked();
 
       if (name_idx >= arraysize(name_v)) {
-        fn->Call(env->context(), names, name_idx, name_v)
-            .ToLocalChecked();
+        MaybeLocal<Value> ret = fn->Call(env->context(), names, name_idx,
+                                         name_v);
+        if (ret.IsEmpty()) {
+          return;
+        }
         name_idx = 0;
       }
     }
 
     if (name_idx > 0) {
-      fn->Call(env->context(), names, name_idx, name_v).ToLocalChecked();
+      MaybeLocal<Value> ret = fn->Call(env->context(), names, name_idx, name_v);
+      if (ret.IsEmpty()) {
+        return;
+      }
     }
 
     args.GetReturnValue().Set(names);

test/parallel/test-fs-readdir-stack-overflow.js

@@ -0,0 +1,18 @@
+'use strict';
+
+const common = require('../common');
+
+const fs = require('fs');
+
+function recurse() {
+  fs.readdirSync('.');
+  recurse();
+}
+
+common.expectsError(
+  () => recurse(),
+  {
+    type: RangeError,
+    message: 'Maximum call stack size exceeded'
+  }
+);