diff --git a/fs/ntfs3/index.c b/fs/ntfs3/index.c
index 7a1e01a2ed9a..f716487ec8a0 100644
--- a/fs/ntfs3/index.c
+++ b/fs/ntfs3/index.c
@@ -994,6 +994,7 @@ struct INDEX_ROOT *indx_get_root(struct ntfs_index *indx, struct ntfs_inode *ni,
 	struct ATTR_LIST_ENTRY *le = NULL;
 	struct ATTRIB *a;
 	const struct INDEX_NAMES *in = &s_index_names[indx->type];
+	struct INDEX_ROOT *root = NULL;
 
 	a = ni_find_attr(ni, NULL, &le, ATTR_ROOT, in->name, in->name_len, NULL,
 			 mi);
@@ -1003,7 +1004,15 @@ struct INDEX_ROOT *indx_get_root(struct ntfs_index *indx, struct ntfs_inode *ni,
 	if (attr)
 		*attr = a;
 
-	return resident_data_ex(a, sizeof(struct INDEX_ROOT));
+	root = resident_data_ex(a, sizeof(struct INDEX_ROOT));
+
+	/* length check */
+	if (root && offsetof(struct INDEX_ROOT, ihdr) + le32_to_cpu(root->ihdr.used) >
+			le32_to_cpu(a->res.data_size)) {
+		return NULL;
+	}
+
+	return root;
 }
 
 static int indx_write(struct ntfs_index *indx, struct ntfs_inode *ni,