linux-kernel - [PATCH] [SCSI] hpsa: Use kcalloc instead of kzalloc to allocate array

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Message-ID: <1322600880.1534.331.camel@localhost.localdomain>
Date:	Tue, 29 Nov 2011 22:08:00 +0100
From:	Thomas Meyer <thomas@...3r.de>
To:	JBottomley@...allels.com, iss_storagedev@...com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [SCSI] hpsa: 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/scsi/hpsa.c b/drivers/scsi/hpsa.c
--- a/drivers/scsi/hpsa.c 2011-11-28 19:36:47.956780228 +0100
+++ b/drivers/scsi/hpsa.c 2011-11-28 20:04:07.554064368 +0100
@@ -821,8 +821,8 @@ static void adjust_hpsa_scsi_table(struc
 	int nadded, nremoved;
 	struct Scsi_Host *sh = NULL;
 
-	added = kzalloc(sizeof(*added) * HPSA_MAX_DEVICES, GFP_KERNEL);
-	removed = kzalloc(sizeof(*removed) * HPSA_MAX_DEVICES, GFP_KERNEL);
+	added = kcalloc(HPSA_MAX_DEVICES, sizeof(*added), GFP_KERNEL);
+	removed = kcalloc(HPSA_MAX_DEVICES, sizeof(*removed), GFP_KERNEL);
 
 	if (!added || !removed) {
 		dev_warn(&h->pdev->dev, "out of memory in "
@@ -994,8 +994,8 @@ static int hpsa_allocate_sg_chain_blocks
 	if (h->chainsize <= 0)
 		return 0;
 
-	h->cmd_sg_list = kzalloc(sizeof(*h->cmd_sg_list) * h->nr_cmds,
-				GFP_KERNEL);
+	h->cmd_sg_list = kcalloc(h->nr_cmds, sizeof(*h->cmd_sg_list),
+				 GFP_KERNEL);
 	if (!h->cmd_sg_list)
 		return -ENOMEM;
 	for (i = 0; i < h->nr_cmds; i++) {
@@ -1866,7 +1866,7 @@ static void hpsa_update_scsi_devices(str
 	int raid_ctlr_position;
 	DECLARE_BITMAP(lunzerobits, HPSA_MAX_TARGETS_PER_CTLR);
 
-	currentsd = kzalloc(sizeof(*currentsd) * HPSA_MAX_DEVICES, GFP_KERNEL);
+	currentsd = kcalloc(HPSA_MAX_DEVICES, sizeof(*currentsd), GFP_KERNEL);
 	physdev_list = kzalloc(reportlunsize, GFP_KERNEL);
 	logdev_list = kzalloc(reportlunsize, GFP_KERNEL);
 	tmpdevice = kzalloc(sizeof(*tmpdevice), GFP_KERNEL);
--
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