tree 0fa55852038849722150149da4ab418f96c945b3
parent 06739a8ad321b1e5140b318c648b0cc4bf8c6daa
author Julia Lawall <julia@diku.dk> 1251043745 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1251043800 +0200

[S390] drivers/s390: put NULL test before dereference

If the NULL test on block is needed, it should be before the dereference of
the base field.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
expression E1,E2;
identifier fld;
statement S1,S2;
@@

E1 = E2->fld;
(
if (E1 == NULL) S1 else S2
|
*if (E2 == NULL) S1 else S2
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>