[PATCH][next] scsi: smartpqi: Replace one-element arrays with flexible-array members

[PATCH][next] scsi: smartpqi: Replace one-element arrays with flexible-array members

[Gustavo A. R. Silva]

One-element arrays are deprecated, and we are replacing them with flexible
array members instead. So, replace one-element arrays with flexible-array
members in a couple of structures, and refactor the rest of the code,
accordingly.

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy().

This results in no differences in binary output.

Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/204
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/scsi/smartpqi/smartpqi.h      | 4 ++--
 drivers/scsi/smartpqi/smartpqi_init.c | 5 ++---
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/smartpqi/smartpqi.h b/drivers/scsi/smartpqi/smartpqi.h
index f960b5095d09..e392eaf5b2bf 100644
--- a/drivers/scsi/smartpqi/smartpqi.h
+++ b/drivers/scsi/smartpqi/smartpqi.h
@@ -982,12 +982,12 @@ struct report_phys_lun_16byte_wwid {
 
 struct report_phys_lun_8byte_wwid_list {
 	struct report_lun_header header;
-	struct report_phys_lun_8byte_wwid lun_entries[1];
+	struct report_phys_lun_8byte_wwid lun_entries[];
 };
 
 struct report_phys_lun_16byte_wwid_list {
 	struct report_lun_header header;
-	struct report_phys_lun_16byte_wwid lun_entries[1];
+	struct report_phys_lun_16byte_wwid lun_entries[];
 };
 
 struct raid_map_disk_data {
diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index 19af36e9a16d..6aaaa7ebca37 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -1203,7 +1203,6 @@ static inline int pqi_report_phys_luns(struct pqi_ctrl_info *ctrl_info, void **b
 	unsigned int i;
 	u8 rpl_response_format;
 	u32 num_physicals;
-	size_t rpl_16byte_wwid_list_length;
 	void *rpl_list;
 	struct report_lun_header *rpl_header;
 	struct report_phys_lun_8byte_wwid_list *rpl_8byte_wwid_list;
@@ -1232,9 +1231,9 @@ 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 = kmalloc(rpl_16byte_wwid_list_length, GFP_KERNEL);
+	rpl_16byte_wwid_list = kmalloc(struct_size(rpl_16byte_wwid_list, lun_entries,
+						   num_physicals), GFP_KERNEL);
 	if (!rpl_16byte_wwid_list)
 		return -ENOMEM;
 
-- 
2.34.1

Re: [PATCH][next] scsi: smartpqi: Replace one-element arrays with flexible-array members

[Kees Cook]

On Wed, Jun 21, 2023 at 02:27:20PM -0600, Gustavo A. R. Silva wrote:
> One-element arrays are deprecated, and we are replacing them with flexible
> array members instead. So, replace one-element arrays with flexible-array
> members in a couple of structures, and refactor the rest of the code,
> accordingly.
> 
> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
> routines on memcpy().
> 
> This results in no differences in binary output.
> 
> Link: https://github.com/KSPP/linux/issues/79
> Link: https://github.com/KSPP/linux/issues/204
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

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

-- 
Kees Cook

Re: [PATCH][next] scsi: smartpqi: Replace one-element arrays with flexible-array members

[Martin K. Petersen]

Gustavo,

> One-element arrays are deprecated, and we are replacing them with
> flexible array members instead. So, replace one-element arrays with
> flexible-array members in a couple of structures, and refactor the
> rest of the code, accordingly.

Applied to 6.5/scsi-staging, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering

Re: [PATCH][next] scsi: smartpqi: Replace one-element arrays with flexible-array members

[Martin K. Petersen]

On Wed, 21 Jun 2023 14:27:20 -0600, Gustavo A. R. Silva wrote:

> One-element arrays are deprecated, and we are replacing them with flexible
> array members instead. So, replace one-element arrays with flexible-array
> members in a couple of structures, and refactor the rest of the code,
> accordingly.
> 
> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
> routines on memcpy().
> 
> [...]

Applied to 6.5/scsi-queue, thanks!

[1/1] scsi: smartpqi: Replace one-element arrays with flexible-array members
      https://git.kernel.org/mkp/scsi/c/6f0a92fd7db1

-- 
Martin K. Petersen	Oracle Linux Engineering