linux-kernel - Re: [PATCH 3/5] drivers/scsi : Correct the size argument to kmalloc

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Message-ID: <Pine.LNX.4.64.0912292113110.4001@ask.diku.dk>
Date:	Tue, 29 Dec 2009 21:13:26 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	Rolf Eike Beer <eike-kernel@...tec.de>
Cc:	James.Bottomley@...e.de, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 3/5] drivers/scsi : Correct the size argument to kmalloc

From: Julia Lawall <julia@...u.dk>

In each case, the destination of the allocation has type struct **, so the
elements of the array should have pointer type, not structure type.

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

// <smpl>
@disable sizeof_type_expr@
type T;
T **x;
@@

  x =
  <+...sizeof(
- T
+ *x
  )...+>
// </smpl>

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

---
 drivers/scsi/aic94xx/aic94xx_init.c |    4 ++--
 drivers/scsi/ch.c                   |    2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff -u -p a/drivers/scsi/aic94xx/aic94xx_init.c b/drivers/scsi/aic94xx/aic94xx_init.c
--- a/drivers/scsi/aic94xx/aic94xx_init.c
+++ b/drivers/scsi/aic94xx/aic94xx_init.c
@@ -687,9 +687,9 @@ static int asd_register_sas_ha(struct as
 {
 	int i;
 	struct asd_sas_phy   **sas_phys =
-		kmalloc(ASD_MAX_PHYS * sizeof(struct asd_sas_phy), GFP_KERNEL);
+		kcalloc(ASD_MAX_PHYS, sizeof(*sas_phys), GFP_KERNEL);
 	struct asd_sas_port  **sas_ports =
-		kmalloc(ASD_MAX_PHYS * sizeof(struct asd_sas_port), GFP_KERNEL);
+		kcalloc(ASD_MAX_PHYS, sizeof(*sas_ports), GFP_KERNEL);
 
 	if (!sas_phys || !sas_ports) {
 		kfree(sas_phys);
diff -u -p a/drivers/scsi/ch.c b/drivers/scsi/ch.c
--- a/drivers/scsi/ch.c
+++ b/drivers/scsi/ch.c
@@ -351,7 +351,7 @@ ch_readconfig(scsi_changer *ch)
 	}
 
 	/* look up the devices of the data transfer elements */
-	ch->dt = kmalloc(ch->counts[CHET_DT]*sizeof(struct scsi_device),
+	ch->dt = kcalloc(ch->counts[CHET_DT], sizeof(*ch->dt),
 			 GFP_KERNEL);
 
 	if (!ch->dt) {
--
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