From: Stephen Kitt <steve@sk2.org>
To: hare@suse.com, axboe@kernel.dk, jejb@linux.vnet.ibm.com,
martin.petersen@oracle.com
Cc: linux-scsi@vger.kernel.org, kernel-hardening@lists.openwall.com,
linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
Stephen Kitt <steve@sk2.org>
Subject: [PATCH] device_handler: remove VLAs
Date: Fri, 9 Mar 2018 23:32:11 +0100 [thread overview]
Message-ID: <20180309223211.20473-1-steve@sk2.org> (raw)
In-Reply-To: <20180309232933.14e39858@heffalump.sk2.org>
In preparation to enabling -Wvla, remove VLAs and replace them with
fixed-length arrays instead.
scsi_dh_{alua,emc,rdac} use variable-length array declarations to
store command blocks, with the appropriate size as determined by
COMMAND_SIZE. This patch replaces these with fixed-sized arrays using
MAX_COMMAND_SIZE, so that the array size can be determined at compile
time.
This was prompted by https://lkml.org/lkml/2018/3/7/621
Signed-off-by: Stephen Kitt <steve@sk2.org>
---
drivers/scsi/device_handler/scsi_dh_alua.c | 8 ++++----
drivers/scsi/device_handler/scsi_dh_emc.c | 2 +-
drivers/scsi/device_handler/scsi_dh_rdac.c | 2 +-
3 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 4b44325d1a82..982a52528a1c 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -138,12 +138,12 @@ static void release_port_group(struct kref *kref)
static int submit_rtpg(struct scsi_device *sdev, unsigned char *buff,
int bufflen, struct scsi_sense_hdr *sshdr, int flags)
{
- u8 cdb[COMMAND_SIZE(MAINTENANCE_IN)];
+ u8 cdb[MAX_COMMAND_SIZE];
int req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
REQ_FAILFAST_DRIVER;
/* Prepare the command. */
- memset(cdb, 0x0, COMMAND_SIZE(MAINTENANCE_IN));
+ memset(cdb, 0x0, MAX_COMMAND_SIZE);
cdb[0] = MAINTENANCE_IN;
if (!(flags & ALUA_RTPG_EXT_HDR_UNSUPP))
cdb[1] = MI_REPORT_TARGET_PGS | MI_EXT_HDR_PARAM_FMT;
@@ -166,7 +166,7 @@ static int submit_rtpg(struct scsi_device *sdev, unsigned char *buff,
static int submit_stpg(struct scsi_device *sdev, int group_id,
struct scsi_sense_hdr *sshdr)
{
- u8 cdb[COMMAND_SIZE(MAINTENANCE_OUT)];
+ u8 cdb[MAX_COMMAND_SIZE];
unsigned char stpg_data[8];
int stpg_len = 8;
int req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
@@ -178,7 +178,7 @@ static int submit_stpg(struct scsi_device *sdev, int group_id,
put_unaligned_be16(group_id, &stpg_data[6]);
/* Prepare the command. */
- memset(cdb, 0x0, COMMAND_SIZE(MAINTENANCE_OUT));
+ memset(cdb, 0x0, MAX_COMMAND_SIZE);
cdb[0] = MAINTENANCE_OUT;
cdb[1] = MO_SET_TARGET_PGS;
put_unaligned_be32(stpg_len, &cdb[6]);
diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
index 6a2792f3a37e..95c47909a58f 100644
--- a/drivers/scsi/device_handler/scsi_dh_emc.c
+++ b/drivers/scsi/device_handler/scsi_dh_emc.c
@@ -249,7 +249,7 @@ static int send_trespass_cmd(struct scsi_device *sdev,
struct clariion_dh_data *csdev)
{
unsigned char *page22;
- unsigned char cdb[COMMAND_SIZE(MODE_SELECT)];
+ unsigned char cdb[MAX_COMMAND_SIZE];
int err, res = SCSI_DH_OK, len;
struct scsi_sense_hdr sshdr;
u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index 7af31a1247ee..d27fabae8ddd 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -533,7 +533,7 @@ static void send_mode_select(struct work_struct *work)
int err = SCSI_DH_OK, retry_cnt = RDAC_RETRY_COUNT;
struct rdac_queue_data *tmp, *qdata;
LIST_HEAD(list);
- unsigned char cdb[COMMAND_SIZE(MODE_SELECT_10)];
+ unsigned char cdb[MAX_COMMAND_SIZE];
struct scsi_sense_hdr sshdr;
unsigned int data_size;
u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
--
2.11.0
next prev parent reply other threads:[~2018-03-09 22:32 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-09 22:29 VLA removal, device_handler and COMMAND_SIZE Stephen Kitt
2018-03-09 22:32 ` Stephen Kitt [this message]
2018-03-09 22:48 ` [PATCH] device_handler: remove VLAs Bart Van Assche
2018-03-10 13:14 ` Stephen Kitt
2018-03-12 15:41 ` Bart Van Assche
2018-03-12 19:26 ` Stephen Kitt
2018-03-12 6:25 ` Hannes Reinecke
2018-03-13 2:37 ` Martin K. Petersen
2018-03-09 22:33 ` [PATCH] scsi: resolve COMMAND_SIZE at compile time Stephen Kitt
2018-03-09 22:47 ` Bart Van Assche
2018-03-10 13:29 ` Stephen Kitt
2018-03-10 20:49 ` James Bottomley
2018-03-10 21:16 ` Douglas Gilbert
2018-03-13 11:34 ` David Laight
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180309223211.20473-1-steve@sk2.org \
--to=steve@sk2.org \
--cc=axboe@kernel.dk \
--cc=hare@suse.com \
--cc=jejb@linux.vnet.ibm.com \
--cc=kernel-hardening@lists.openwall.com \
--cc=linux-block@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
--cc=martin.petersen@oracle.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).