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

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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 <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Julia Lawall 2009-08-23 18:09:05 +02:00 • committed by Martin Schwidefsky
commit cf05b824db
1 changed files with 1 additions and 1 deletions
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2
drivers/s390/block/dasd.c
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@ -2135,9 +2135,9 @@ static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
struct dasd_device *base;
block = bdev->bd_disk->private_data;
base = block->base;
if (!block)
return -ENODEV;
base = block->base;
if (!base->discipline ||
!base->discipline->fill_geometry)