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ataflop: adjust NULL test 

dtp is derefenced on the lines above the test !dtp, and so it cannot be
NULL at this point.

A simplified version of the semantic match that finds this problem is as
follows: (http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r@
expression x,E,E1;
identifier f,l;
position p1,p2;
@@

*x@p1->f = E1;
... when != x = E
    when != goto l;
(
*x@p2 == NULL
|
*x@p2 != NULL
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Julia Lawall 2009-07-13 22:43:41 +02:00 committed by Tejun Heo
parent 0a09f4319c
commit 8f47428704
1 changed files with 1 additions and 1 deletions
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2
drivers/block/ataflop.c
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@ -1627,7 +1627,7 @@ static int fd_ioctl(struct block_device *bdev, fmode_t mode,
drive, dtp->blocks, dtp->spt, dtp->stretch);
/* sanity check */
if (!dtp || setprm.track != dtp->blocks/dtp->spt/2 ||
if (setprm.track != dtp->blocks/dtp->spt/2 ||
setprm.head != 2) {
redo_fd_request();
return -EINVAL;