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Subject[PATCH net-next] net: hns: Use struct_size() in devm_kzalloc()
One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct foo {
int stuff;
struct boo entry[];

instance = devm_kzalloc(dev, sizeof(struct foo) + count * sizeof(struct boo), GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:

instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <>
drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c
index 5d64519b9b1d..6bf346c11b25 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_rcb.c
@@ -788,8 +788,9 @@ int hns_rcb_common_get_cfg(struct dsaf_device *dsaf_dev,
int ring_num = hns_rcb_get_ring_num(dsaf_dev);

rcb_common =
- devm_kzalloc(dsaf_dev->dev, sizeof(*rcb_common) +
- ring_num * sizeof(struct ring_pair_cb), GFP_KERNEL);
+ devm_kzalloc(dsaf_dev->dev,
+ struct_size(rcb_common, ring_pair_cb, ring_num),
if (!rcb_common) {
dev_err(dsaf_dev->dev, "rcb common devm_kzalloc fail!\n");
return -ENOMEM;
 \ /
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