[PATCH] initialize all fields

Julia Lawall Julia.Lawall at lip6.fr
Mon Jan 30 03:05:54 PST 2012

This patch fixes a case where a structure field is not initialized before
the structureis copied to user level.

The semantic match that finds this problem is as follows
(http://coccinelle.lip6.fr/).  It uses other references to the same
structure in the current file to find the set of fields that should be

@a disable decl_init@
identifier x,x1;
type T,T1;
expression e,sz;

T x;
... when any

a.T y;
identifier f,f1,f2;


identifier a.x,r.f;
type a.T;
expression e,e1,sz;
position p,p0;

T x at p0;
... when != x.f = e1
    when != &x
    when != &(x.f)
    when != get_user(x.f,...)
    when != __get_user(x.f,...)
    when != x = e1
copy_to_user at p(e,&x,sz)

t << a.T;
x << a.x;
f << r.f;
p << b.p;

Printf.printf "%s:%d: %s %s missing %s\n" (List.hd p).file (List.hd p).line
   t x f

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