Fix broken symlink traversal issue

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 .DS_Store
+.idea/

index.js

@@ -17,6 +17,25 @@ function toMatcherFunction(ignoreEntry) {
   }
 }
 
+function _getFileStat(filePath, callback) {
+  fs.stat(filePath, function (err, stats) {
+    if (err) {
+      if (err.code === 'ENOENT') {
+        fs.lstat(filePath, function (_err, _stats) {
+          if (_err) {
+            return callback(_err);
+          }
+          return callback(null, _stats);
+        });
+      } else {
+        return callback(err);
+      }
+    }
+
+    return callback(null, stats);
+  });
+}
+
 function readdir(path, ignores, callback) {
   if (typeof ignores == "function") {
     callback = ignores;
@@ -52,7 +71,7 @@ function readdir(path, ignores, callback) {
 
     files.forEach(function(file) {
       var filePath = p.join(path, file);
-      fs.stat(filePath, function(_err, stats) {
+      _getFileStat(filePath, function(_err, stats) {
         if (_err) {
           return callback(_err);
         }
@@ -69,7 +88,7 @@ function readdir(path, ignores, callback) {
           return null;
         }
 
-        if (stats.isDirectory()) {
+        if (stats && stats.isDirectory && stats.isDirectory()) {
           readdir(filePath, ignores, function(__err, res) {
             if (__err) {
               return callback(__err);

test/recursive-readdir-test.js

@@ -361,6 +361,22 @@ describe("readdir", function() {
     });
   });
 
+  it("does not fail if the symlink is broken and returns the symlink in file list", function(done) {
+    var expectedFiles = getAbsolutePaths([
+      "/testsymlinks/testbroken/file.dat.alias"
+    ]);
+
+    readdir(p.join(__dirname, "testsymlinks", "testbroken"), function(err, list) {
+      assert.ifError(err);
+      assert.deepEqual(
+        list.sort(),
+        expectedFiles,
+        "Failed to find expected files."
+      );
+      done();
+    });
+  });
+
   if (!global.Promise) {
     console.log("Native Promise not supported - skipping tests");
   } else {