src: use S_ISDIR to check if the file is a directory

PR-URL: nodejs#52164
Fixes: nodejs#52159
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

src/node_file.cc

@@ -1054,7 +1054,7 @@ static void InternalModuleStat(const FunctionCallbackInfo<Value>& args) {
   int rc = uv_fs_stat(env->event_loop(), &req, *path, nullptr);
   if (rc == 0) {
     const uv_stat_t* const s = static_cast<const uv_stat_t*>(req.ptr);
-    rc = !!(s->st_mode & S_IFDIR);
+    rc = S_ISDIR(s->st_mode);
   }
   uv_fs_req_cleanup(&req);
 
@@ -2982,7 +2982,7 @@ BindingData::FilePathIsFileReturnType BindingData::FilePathIsFile(
 
   if (rc == 0) {
     const uv_stat_t* const s = static_cast<const uv_stat_t*>(req.ptr);
-    rc = !!(s->st_mode & S_IFDIR);
+    rc = S_ISDIR(s->st_mode);
   }
 
   uv_fs_req_cleanup(&req);

src/permission/fs_permission.cc

@@ -21,7 +21,7 @@ std::string WildcardIfDir(const std::string& res) noexcept {
   int rc = uv_fs_stat(nullptr, &req, res.c_str(), nullptr);
   if (rc == 0) {
     const uv_stat_t* const s = static_cast<const uv_stat_t*>(req.ptr);
-    if (s->st_mode & S_IFDIR) {
+    if ((s->st_mode & S_IFMT) == S_IFDIR) {
       // add wildcard when directory
       if (res.back() == node::kPathSeparator) {
         return res + "*";

test/parallel/test-fs-readdir-recursive.js

@@ -0,0 +1,14 @@
+'use strict';
+const common = require('../common');
+const fs = require('fs');
+const net = require('net');
+
+const tmpdir = require('../common/tmpdir');
+tmpdir.refresh();
+
+const server = net.createServer().listen(common.PIPE, common.mustCall(() => {
+  // The process should not crash
+  // See https://github.com/nodejs/node/issues/52159
+  fs.readdirSync(tmpdir.path, { recursive: true });
+  server.close();
+}));