linux-hardening - [PATCH 6/8][next] scsi: aacraid: Replace one-element array with flexible-array member in struct sgmapraw

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Date:   Tue, 22 Feb 2022 01:30:35 -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 6/8][next] scsi: aacraid: Replace one-element array with
 flexible-array member in struct sgmapraw

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

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  | 18 ++++++------------
 drivers/scsi/aacraid/aacraid.h |  2 +-
 2 files changed, 7 insertions(+), 13 deletions(-)

diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index 02b75a2c3a88..5c089993cf2a 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -1224,7 +1224,8 @@ static void io_callback(void *context, struct fib * fibptr);
 static int aac_read_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u32 count)
 {
 	struct aac_dev *dev = fib->dev;
-	u16 fibsize, command;
+	size_t fibsize;
+	u16 command;
 	long ret;
 
 	aac_fib_init(fib);
@@ -1262,8 +1263,7 @@ static int aac_read_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u3
 		if (ret < 0)
 			return ret;
 		command = ContainerRawIo;
-		fibsize = sizeof(struct aac_raw_io) +
-			((le32_to_cpu(readcmd->sg.count)-1) * sizeof(struct sgentryraw));
+		fibsize = struct_size(readcmd, sg.sg, le32_to_cpu(readcmd->sg.count));
 	}
 
 	BUG_ON(fibsize > (fib->dev->max_fib_size - sizeof(struct aac_fibhdr)));
@@ -1348,7 +1348,8 @@ static int aac_read_block(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u32
 static int aac_write_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u32 count, int fua)
 {
 	struct aac_dev *dev = fib->dev;
-	u16 fibsize, command;
+	size_t fibsize;
+	u16 command;
 	long ret;
 
 	aac_fib_init(fib);
@@ -1392,8 +1393,7 @@ static int aac_write_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u
 		if (ret < 0)
 			return ret;
 		command = ContainerRawIo;
-		fibsize = sizeof(struct aac_raw_io) +
-			((le32_to_cpu(writecmd->sg.count)-1) * sizeof (struct sgentryraw));
+		fibsize = struct_size(writecmd, sg.sg, le32_to_cpu(writecmd->sg.count));
 	}
 
 	BUG_ON(fibsize > (fib->dev->max_fib_size - sizeof(struct aac_fibhdr)));
@@ -3861,12 +3861,6 @@ static long aac_build_sgraw(struct scsi_cmnd *scsicmd, struct sgmapraw *psg)
 
 	// Get rid of old data
 	psg->count = 0;
-	psg->sg[0].next = 0;
-	psg->sg[0].prev = 0;
-	psg->sg[0].addr[0] = 0;
-	psg->sg[0].addr[1] = 0;
-	psg->sg[0].count = 0;
-	psg->sg[0].flags = 0;
 
 	nseg = scsi_dma_map(scsicmd);
 	if (nseg <= 0)
diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
index fa5a93b4dc7b..511a58ec5c9d 100644
--- a/drivers/scsi/aacraid/aacraid.h
+++ b/drivers/scsi/aacraid/aacraid.h
@@ -526,7 +526,7 @@ struct user_sgmap64 {
 
 struct sgmapraw {
 	__le32		  count;
-	struct sgentryraw sg[1];
+	struct sgentryraw sg[];
 };
 
 struct user_sgmapraw {
-- 
2.27.0