UCS/VFS/BASE: convert stack allocation at ucs_vfs_node_add_subdir() t…

…o heap

src/ucs/vfs/base/vfs_obj.c

@@ -223,17 +223,26 @@ static void ucs_vfs_node_build_path(ucs_vfs_node_t *parent_node,
 static ucs_vfs_node_t *
 ucs_vfs_node_add_subdir(ucs_vfs_node_t *parent_node, const char *name)
 {
- char path_buf[PATH_MAX];
+ char *path_buf = ucs_malloc(PATH_MAX, "path_buf");
  ucs_vfs_node_t *node;
 
- ucs_vfs_node_build_path(parent_node, name, path_buf, sizeof(path_buf));
+ if (path_buf == NULL) {
+ ucs_error("failed to allocate memory for path_buf");
+ return NULL;
+ }
+
+ ucs_vfs_node_build_path(parent_node, name, path_buf, PATH_MAX);
  node = ucs_vfs_node_find_by_path(path_buf);
  if (node != NULL) {
+ ucs_free(path_buf);
  return node;
  }
 
- return ucs_vfs_node_create(parent_node, path_buf, UCS_VFS_NODE_TYPE_SUBDIR,
+ node = ucs_vfs_node_create(parent_node, path_buf, UCS_VFS_NODE_TYPE_SUBDIR,
  NULL);
+ ucs_free(path_buf);
+
+ return node;
 }
 
 static int ucs_vfs_node_need_update_path(ucs_vfs_node_type_t type,