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[3/3,next] scsi: smartpqi: Use struct_size() helper in pqi_report_phys_luns()

Message ID b6a23dbc136710e98580ac01daa39ad971eecb5d.1663816572.git.gustavoars@kernel.org
State New
Headers show
Series scsi: smartpqi: Replace one-element arrays with flexible-array members | expand

Commit Message

Gustavo A. R. Silva Sept. 22, 2022, 4:30 a.m. UTC
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@kernel.org>
---
 drivers/scsi/smartpqi/smartpqi_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Kees Cook Feb. 2, 2023, 8:29 p.m. UTC | #1
On Wed, Sep 21, 2022 at 11:30:47PM -0500, Gustavo A. R. Silva wrote:
> 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@kernel.org>

Reviewed-by: Kees Cook <keescook@chromium.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
>
diff mbox series

Patch

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)