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blk-iocost: Use struct_size() in kzalloc_node()

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Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

This code was detected with the help of Coccinelle and, audited and
fixed manually.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Addresses-KSPP-ID: https://github.com/KSPP/linux/issues/83
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Gustavo A. R. Silva 2020-06-19 18:08:30 -05:00 committed by Jens Axboe
parent 1f4fe21cf4
commit f61d6e259c
1 changed files with 1 additions and 2 deletions
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3
block/blk-iocost.c
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@ -2045,8 +2045,7 @@ static struct blkg_policy_data *ioc_pd_alloc(gfp_t gfp, struct request_queue *q,
int levels = blkcg->css.cgroup->level + 1;
struct ioc_gq *iocg;
iocg = kzalloc_node(sizeof(*iocg) + levels * sizeof(iocg->ancestors[0]),
gfp, q->node);
iocg = kzalloc_node(struct_size(iocg, ancestors, levels), gfp, q->node);
if (!iocg)
return NULL;