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netfilter: xt_hashlimit: use struct_size() helper

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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, in particular in the
context in which this code is being used.

So, replace code of the following form:

sizeof(struct xt_hashlimit_htable) + sizeof(struct hlist_head) * size

with:

struct_size(hinfo, hash, size)

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Gustavo A. R. Silva 2019-05-01 17:01:08 -05:00 committed by Pablo Neira Ayuso
parent 1de6f33421
commit eabb478219
1 changed files with 1 additions and 2 deletions
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3
net/netfilter/xt_hashlimit.c
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@ -288,8 +288,7 @@ static int htable_create(struct net *net, struct hashlimit_cfg3 *cfg,
size = 16;
}
/* FIXME: don't use vmalloc() here or anywhere else -HW */
hinfo = vmalloc(sizeof(struct xt_hashlimit_htable) +
sizeof(struct hlist_head) * size);
hinfo = vmalloc(struct_size(hinfo, hash, size));
if (hinfo == NULL)
return -ENOMEM;
*out_hinfo = hinfo;