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From: "Gustavo A. R. Silva" <>
To: Jens Axboe <>
	"Gustavo A. R. Silva" <>
Subject: [PATCH][next] blk-iocost: Use struct_size() in kzalloc_node()
Date: Fri, 19 Jun 2020 18:08:30 -0500
Message-ID: <20200619230830.GA25608@embeddedor> (raw)

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 <>
 block/blk-iocost.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 8ac4aad66ebc..cea5ee9be639 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -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;

             reply index

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-19 23:08 Gustavo A. R. Silva [this message]
2020-06-20 21:25 ` Jens Axboe

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