[PATCH 3/4] drivers/scsi/mpt2sas/mpt2sas_transport.c: take size of pointed value, not pointer

September 16th, 2011 - 03:00 am ET by Julia Lawall | Report spam
From: Julia Lawall <julia@diku.dk>

Sizeof a pointer-typed expression returns the size of the pointer, not that
of the pointed data.

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

// <smpl>
@@
expression *e;
type T;
identifier f;
@@

f(...,(T)e,...,
-sizeof(e)
+sizeof(*e)
,...)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>


drivers/scsi/mpt2sas/mpt2sas_transport.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/drivers/scsi/mpt2sas/mpt2sas_transport.c b/drivers/scsi/mpt2sas/mpt2sas_transport.c
a/drivers/scsi/mpt2sas/mpt2sas_transport.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_transport.c
@@ -163,7 +163,7 @@ _transport_set_identify(struct MPT2SAS_A
return -EIO;
}

- memset(identify, 0, sizeof(identify));
+ memset(identify, 0, sizeof(*identify));
device_info = le32_to_cpu(sas_device_pg0.DeviceInfo);

/* sas_address */

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#1 Joe Perches
September 16th, 2011 - 12:40 pm ET | Report spam
On Fri, 2011-09-16 at 08:57 +0200, Julia Lawall wrote:
Sizeof a pointer-typed expression returns the size of the pointer, not that
of the pointed data.



Hi Julia.

I submitted the same thing in May.
I hope it takes this time.

https://lkml.org/lkml/2011/5/9/31


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