Author: Julia Lawall <julia@diku.dk> The result of calling kzalloc is never used or freed. The semantic match that finds this problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // @r exists@ local idexpression x; statement S; expression E; identifier f,f1,l; position p1,p2; expression *ptr != NULL; @@ x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(…); … if (x == NULL) S f1 = …