linux-hardening - [PATCH v3] scsi: csiostor: Use kcalloc() instead of kzalloc()

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Message-ID:
 <AS8PR02MB7237BA2BBAA646DFDB21C63B8B392@AS8PR02MB7237.eurprd02.prod.outlook.com>
Date: Sat, 30 Mar 2024 17:17:53 +0100
From: Erick Archer <erick.archer@...look.com>
To: "James E.J. Bottomley" <jejb@...ux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Kees Cook <keescook@...omium.org>
Cc: Erick Archer <erick.archer@...look.com>,
	linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH v3] scsi: csiostor: Use kcalloc() instead of kzalloc()

Use 2-factor multiplication argument form kcalloc() instead
of kzalloc().

Also, it is preferred to use sizeof(*pointer) instead of
sizeof(type) due to the type of the variable can change and
one needs not change the former (unlike the latter).

Link: https://github.com/KSPP/linux/issues/162
Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Signed-off-by: Erick Archer <erick.archer@...look.com>
---
Changes in v2:
- Update the changelog text describing the sizeof()
  changes (Gustavo A. R. Silva)

Changes in v3:
- Add the "Reviewed-by:" tag.
- Rebase against linux-next.

Version 1:
Link: https://lore.kernel.org/linux-hardening/20240112182603.11048-1-erick.archer@gmx.com/

Version 2:
Link: https://lore.kernel.org/linux-hardening/20240114102400.3816-1-erick.archer@gmx.com/

Hi everyone,

This patch seems to be lost. Gustavo reviewed it on January 15, 2024
but the patch has not been applied since.

Thanks,
Erick
---
 drivers/scsi/csiostor/csio_init.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/scsi/csiostor/csio_init.c b/drivers/scsi/csiostor/csio_init.c
index d649b7a2a879..d72892e44fd1 100644
--- a/drivers/scsi/csiostor/csio_init.c
+++ b/drivers/scsi/csiostor/csio_init.c
@@ -698,8 +698,7 @@ csio_lnodes_block_request(struct csio_hw *hw)
 	struct csio_lnode **lnode_list;
 	int cur_cnt = 0, ii;
 
-	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
-			GFP_KERNEL);
+	lnode_list = kcalloc(hw->num_lns, sizeof(*lnode_list), GFP_KERNEL);
 	if (!lnode_list) {
 		csio_err(hw, "Failed to allocate lnodes_list");
 		return;
@@ -737,8 +736,7 @@ csio_lnodes_unblock_request(struct csio_hw *hw)
 	struct csio_lnode **lnode_list;
 	int cur_cnt = 0, ii;
 
-	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
-			GFP_KERNEL);
+	lnode_list = kcalloc(hw->num_lns, sizeof(*lnode_list), GFP_KERNEL);
 	if (!lnode_list) {
 		csio_err(hw, "Failed to allocate lnodes_list");
 		return;
@@ -775,8 +773,7 @@ csio_lnodes_block_by_port(struct csio_hw *hw, uint8_t portid)
 	struct csio_lnode **lnode_list;
 	int cur_cnt = 0, ii;
 
-	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
-			GFP_KERNEL);
+	lnode_list = kcalloc(hw->num_lns, sizeof(*lnode_list), GFP_KERNEL);
 	if (!lnode_list) {
 		csio_err(hw, "Failed to allocate lnodes_list");
 		return;
@@ -816,8 +813,7 @@ csio_lnodes_unblock_by_port(struct csio_hw *hw, uint8_t portid)
 	struct csio_lnode **lnode_list;
 	int cur_cnt = 0, ii;
 
-	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
-			GFP_KERNEL);
+	lnode_list = kcalloc(hw->num_lns, sizeof(*lnode_list), GFP_KERNEL);
 	if (!lnode_list) {
 		csio_err(hw, "Failed to allocate lnodes_list");
 		return;
@@ -855,8 +851,7 @@ csio_lnodes_exit(struct csio_hw *hw, bool npiv)
 	struct csio_lnode **lnode_list;
 	int cur_cnt = 0, ii;
 
-	lnode_list = kzalloc((sizeof(struct csio_lnode *) * hw->num_lns),
-			GFP_KERNEL);
+	lnode_list = kcalloc(hw->num_lns, sizeof(*lnode_list), GFP_KERNEL);
 	if (!lnode_list) {
 		csio_err(hw, "lnodes_exit: Failed to allocate lnodes_list.\n");
 		return;
-- 
2.25.1