[PATCH][next] net/sched: cls_u32: Use struct_size() in kzalloc()

["Gustavo A. R. Silva" <gustavoars@kernel.org>]

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>
---
 net/sched/cls_u32.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index e15ff335953d..771b068f8254 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -796,9 +796,7 @@ static struct tc_u_knode *u32_init_knode(struct net *net, struct tcf_proto *tp,
 	struct tc_u32_sel *s = &n->sel;
 	struct tc_u_knode *new;
 
-	new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key),
-		      GFP_KERNEL);
-
+	new = kzalloc(struct_size(new, sel.keys, s->nkeys), GFP_KERNEL);
 	if (!new)
 		return NULL;
 
-- 
2.27.0