Author: Julia Lawall <julia@diku.dk> list_entry, which is an alias for container_of, cannot return NULL, as there is no way to add a NULL value to a doubly linked list. A simplified version of the semantic match that findds this problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // @r@ expression x,E; statement S1,S2; position p,p1; @@ *x = …