diff --git a/fs/hmdfs/hmdfs_device_view.h b/fs/hmdfs/hmdfs_device_view.h
index a1f792d9eb0f68ad1ea5eaabf75a6b09f2f5178f..3b0f489d5db843d2042120c0e5d95f62caff2e9f 100644
--- a/fs/hmdfs/hmdfs_device_view.h
+++ b/fs/hmdfs/hmdfs_device_view.h
@@ -201,6 +201,14 @@ int hmdfs_convert_lookup_flags(unsigned int hmdfs_flags,
 			       unsigned int *vfs_flags);
 static inline void hmdfs_get_lower_path(struct dentry *dent, struct path *pname)
 {
+	if (!hmdfs_d(dent)) {
+		hmdfs_err("private data is NULL");
+		return;
+	}
+	if (!hmdfs_d(dent)->lower_path) {
+		hmdfs_err("lower_path is NULL");
+		return;
+	}
 	spin_lock(&hmdfs_d(dent)->lock);
 	pname->dentry = hmdfs_d(dent)->lower_path.dentry;
 	pname->mnt = hmdfs_d(dent)->lower_path.mnt;