linux-kernel - [PATCH] IB/ipath: Use kcalloc instead of kzalloc to allocate array

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Message-ID: <1322600880.1534.304.camel@localhost.localdomain>
Date:	Tue, 29 Nov 2011 22:08:00 +0100
From:	Thomas Meyer <thomas@...3r.de>
To:	infinipath@...gic.com, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] IB/ipath: Use kcalloc instead of kzalloc to allocate array

The advantage of kcalloc is, that will prevent integer overflows which could
result from the multiplication of number of elements and size and it is also
a bit nicer to read.

The semantic patch that makes this change is available
in https://lkml.org/lkml/2011/11/25/107

Signed-off-by: Thomas Meyer <thomas@...3r.de>
---

diff -u -p a/drivers/infiniband/hw/ipath/ipath_init_chip.c b/drivers/infiniband/hw/ipath/ipath_init_chip.c
--- a/drivers/infiniband/hw/ipath/ipath_init_chip.c 2011-11-13 11:07:26.560156736 +0100
+++ b/drivers/infiniband/hw/ipath/ipath_init_chip.c 2011-11-28 19:51:35.998484248 +0100
@@ -264,7 +264,7 @@ static int init_chip_first(struct ipath_
 	 * Allocate full portcnt array, rather than just cfgports, because
 	 * cleanup iterates across all possible ports.
 	 */
-	dd->ipath_pd = kzalloc(sizeof(*dd->ipath_pd) * dd->ipath_portcnt,
+	dd->ipath_pd = kcalloc(dd->ipath_portcnt, sizeof(*dd->ipath_pd),
 			       GFP_KERNEL);
 
 	if (!dd->ipath_pd) {
diff -u -p a/drivers/infiniband/hw/ipath/ipath_verbs.c b/drivers/infiniband/hw/ipath/ipath_verbs.c
--- a/drivers/infiniband/hw/ipath/ipath_verbs.c 2011-11-13 11:07:26.580157050 +0100
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.c 2011-11-28 19:51:33.611773039 +0100
@@ -2037,7 +2037,7 @@ int ipath_register_ib_device(struct ipat
 	 * the LKEY).  The remaining bits act as a generation number or tag.
 	 */
 	idev->lk_table.max = 1 << ib_ipath_lkey_table_size;
-	idev->lk_table.table = kzalloc(idev->lk_table.max *
+	idev->lk_table.table = kcalloc(idev->lk_table.max,
 				       sizeof(*idev->lk_table.table),
 				       GFP_KERNEL);
 	if (idev->lk_table.table == NULL) {
--
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