linux-hardening - [PATCH 3/3][next] scsi: smartpqi: Use struct_size() helper in pqi_report_phys

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Message-ID: <b6a23dbc136710e98580ac01daa39ad971eecb5d.1663816572.git.gustavoars@kernel.org>
Date:   Wed, 21 Sep 2022 23:30:47 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Kevin Barnett <kevin.barnett@...rosemi.com>,
        Don Brace <don.brace@...rochip.com>, storagedev@...rochip.com,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH 3/3][next] scsi: smartpqi: Use struct_size() helper in
 pqi_report_phys_luns()

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@...nel.org>
---
 drivers/scsi/smartpqi/smartpqi_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index 544cd18a90d7..17bdc8b3f161 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -1192,7 +1192,7 @@ static inline int pqi_report_phys_luns(struct pqi_ctrl_info *ctrl_info, void **b
 
 	rpl_8byte_wwid_list = rpl_list;
 	num_physicals = get_unaligned_be32(&rpl_8byte_wwid_list->header.list_length) / sizeof(rpl_8byte_wwid_list->lun_entries[0]);
-	rpl_16byte_wwid_list_length = sizeof(struct report_lun_header) + (num_physicals * sizeof(struct report_phys_lun_16byte_wwid));
+	rpl_16byte_wwid_list_length = struct_size(rpl_16byte_wwid_list, lun_entries, num_physicals);
 
 	rpl_16byte_wwid_list = kmalloc(rpl_16byte_wwid_list_length, GFP_KERNEL);
 	if (!rpl_16byte_wwid_list)
-- 
2.34.1