tree b202228823f26c0452b882ffe12a1928ca549853
parent 8202cd720637e891639bf8e4af00d5431553c5b9
author Julia Lawall <Julia.Lawall@lip6.fr> 1417367024 +0100
committer Herbert Xu <herbert@gondor.apana.org.au> 1417532149 +0800

crypto: sha - replace memset by memzero_explicit

Memset on a local variable may be removed when it is called just before the
variable goes out of scope.  Using memzero_explicit defeats this
optimization.  A simplified version of the semantic patch that makes this
change is as follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier x;
type T;
@@

{
... when any
T x[...];
... when any
    when exists
- memset
+ memzero_explicit
  (x,
-0,
  ...)
... when != x
    when strict
}
// </smpl>

This change was suggested by Daniel Borkmann <dborkman@redhat.com>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>