linux-hardening - [PATCH 1/8][next] scsi: aacraid: Replace one-element array with flexible-array member

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Date:   Tue, 22 Feb 2022 01:28:54 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Adaptec OEM Raid Solutions <aacraid@...rosemi.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-hardening@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: [PATCH 1/8][next] scsi: aacraid: Replace one-element array with
 flexible-array member

Replace one-element array with flexible-array member in struct
aac_ciss_phys_luns_resp.

Also, use the struct_size() helper to properly calculate the total size
for allocation.

This issue was found with the help of Coccinelle and audited and fixed,
manually.

Link: https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
Link: https://github.com/KSPP/linux/issues/79
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/scsi/aacraid/aachba.c  | 5 ++---
 drivers/scsi/aacraid/aacraid.h | 2 +-
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index b04d039da276..98100e28e95e 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -1823,13 +1823,12 @@ static inline void aac_free_safw_ciss_luns(struct aac_dev *dev)
 static int aac_get_safw_ciss_luns(struct aac_dev *dev)
 {
 	int rcode = -ENOMEM;
-	int datasize;
+	size_t datasize;
 	struct aac_srb *srbcmd;
 	struct aac_srb_unit srbu;
 	struct aac_ciss_phys_luns_resp *phys_luns;
 
-	datasize = sizeof(struct aac_ciss_phys_luns_resp) +
-		(AAC_MAX_TARGETS - 1) * sizeof(struct _ciss_lun);
+	datasize = struct_size(phys_luns, lun, AAC_MAX_TARGETS);
 	phys_luns = kmalloc(datasize, GFP_KERNEL);
 	if (phys_luns == NULL)
 		goto out;
diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
index 3733df77bc65..704440a96daa 100644
--- a/drivers/scsi/aacraid/aacraid.h
+++ b/drivers/scsi/aacraid/aacraid.h
@@ -321,7 +321,7 @@ struct aac_ciss_phys_luns_resp {
 		u8	level3[2];
 		u8	level2[2];
 		u8	node_ident[16];	/* phys. node identifier */
-	} lun[1];			/* List of phys. devices */
+	} lun[];			/* List of phys. devices */
 };
 
 /*
-- 
2.27.0