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From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
To: HighPoint Linux Team <linux@highpoint-tech.com>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@kernel.org>,
	linux-hardening@vger.kernel.org
Subject: [PATCH 2/2][next] scsi: hptiop: Use struct_size() helper in code related to struct hpt_iop_request_scsi_command
Date: Thu, 22 Sep 2022 11:55:33 -0500	[thread overview]
Message-ID: <54e2bb1e39b21394c5a90cacbadfb6136b012788.1663865333.git.gustavoars@kernel.org> (raw)
In-Reply-To: <cover.1663865333.git.gustavoars@kernel.org>

Prefer struct_size() over open-coded versions of idiom:

sizeof(struct-with-flex-array) + sizeof(typeof-flex-array-elements) * count

where count is the max number of items the flexible array is supposed to
contain.

Link: https://github.com/KSPP/linux/issues/160
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/scsi/hptiop.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/hptiop.c b/drivers/scsi/hptiop.c
index cfc6546e35a6..7e8903718245 100644
--- a/drivers/scsi/hptiop.c
+++ b/drivers/scsi/hptiop.c
@@ -1044,9 +1044,7 @@ static int hptiop_queuecommand_lck(struct scsi_cmnd *scp)
 	req->channel = scp->device->channel;
 	req->target = scp->device->id;
 	req->lun = scp->device->lun;
-	req->header.size = cpu_to_le32(
-				sizeof(struct hpt_iop_request_scsi_command)
-				 + sg_count * sizeof(struct hpt_iopsg));
+	req->header.size = cpu_to_le32(struct_size(req, sg_list, sg_count));
 
 	memcpy(req->cdb, scp->cmnd, sizeof(req->cdb));
 	hba->ops->post_req(hba, _req);
@@ -1396,8 +1394,8 @@ static int hptiop_probe(struct pci_dev *pcidev, const struct pci_device_id *id)
 	host->cmd_per_lun = le32_to_cpu(iop_config.max_requests);
 	host->max_cmd_len = 16;
 
-	req_size = sizeof(struct hpt_iop_request_scsi_command)
-		+ sizeof(struct hpt_iopsg) * hba->max_sg_descriptors;
+	req_size = struct_size((struct hpt_iop_request_scsi_command *)0,
+			       sg_list, hba->max_sg_descriptors);
 	if ((req_size & 0x1f) != 0)
 		req_size = (req_size + 0x1f) & ~0x1f;
 
-- 
2.34.1


  parent reply	other threads:[~2022-09-22 16:55 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-22 16:52 [PATCH 0/2][next] Replace one-element array with flexible-array member Gustavo A. R. Silva
2022-09-22 16:53 ` [PATCH 1/2][next] scsi: hptiop: " Gustavo A. R. Silva
2022-09-24  6:01   ` Kees Cook
2022-09-22 16:55 ` Gustavo A. R. Silva [this message]
2022-09-24  6:06   ` [PATCH 2/2][next] scsi: hptiop: Use struct_size() helper in code related to struct hpt_iop_request_scsi_command Kees Cook
2022-09-25 17:03 ` [PATCH 0/2][next] Replace one-element array with flexible-array member Martin K. Petersen

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