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[2/2,next] scsi: hptiop: Use struct_size() helper in code related to struct hpt_iop_request_scsi_command

Message ID 54e2bb1e39b21394c5a90cacbadfb6136b012788.1663865333.git.gustavoars@kernel.org
State New
Headers show
Series Replace one-element array with flexible-array member | expand

Commit Message

Gustavo A. R. Silva Sept. 22, 2022, 4:55 p.m. UTC 
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(-)

Comments

Kees Cook Sept. 24, 2022, 6:06 a.m. UTC | #1 
On Thu, Sep 22, 2022 at 11:55:33AM -0500, Gustavo A. R. Silva wrote:
> 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>

Looks correct; thanks!

Reviewed-by: Kees Cook <keescook@chromium.org>
diff mbox series

Patch

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;