Re: [PATCH v2] staging: greybus: power_supply: use struct_size() helper

From: Rui Miguel Silva
Date: Thu Apr 18 2019 - 04:59:22 EST


Oi Gustavo,
Thanks for the patch, and the rebasing.

On Wed 17 Apr 2019 at 19:44, Gustavo A. R. Silva wrote:
Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes, in particular in the
context in which this code is being used.

So, replace code of the following form:

sizeof(*resp) + props_count * sizeof(struct gb_power_supply_props_desc)

with:

struct_size(resp, props, props_count)

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>

Reviewed-by: Rui Miguel Silva <rmfrfs@xxxxxxxxx>

---
Cheers,
Rui


---
Changes in v2:
- Rebase on top of 47830c1127ef ("staging: greybus: power_supply: fix prop-descriptor request size")

drivers/staging/greybus/power_supply.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/greybus/power_supply.c b/drivers/staging/greybus/power_supply.c
index ae5c0285a942..34b40a409ea3 100644
--- a/drivers/staging/greybus/power_supply.c
+++ b/drivers/staging/greybus/power_supply.c
@@ -520,8 +520,8 @@ static int gb_power_supply_prop_descriptors_get(struct gb_power_supply *gbpsy)
op = gb_operation_create(connection,
GB_POWER_SUPPLY_TYPE_GET_PROP_DESCRIPTORS,
- sizeof(*req), sizeof(*resp) + props_count *
- sizeof(struct gb_power_supply_props_desc),
+ sizeof(*req),
+ struct_size(resp, props, props_count),
GFP_KERNEL);
if (!op)
return -ENOMEM;