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mpls_iptunnel: use struct_size() helper

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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 = alloc(sizeof(struct foo) + count * sizeof(struct boo));

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

instance = alloc(struct_size(instance, entry, count));

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gustavo A. R. Silva 2019-02-07 19:10:52 -06:00 committed by David S. Miller
parent 8fe5756c73
commit b4ba9354cc
1 changed files with 2 additions and 2 deletions
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4
net/mpls/mpls_iptunnel.c
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@ -183,8 +183,8 @@ static int mpls_build_state(struct nlattr *nla,
&n_labels, NULL, extack))
return -EINVAL;
newts = lwtunnel_state_alloc(sizeof(*tun_encap_info) +
n_labels * sizeof(u32));
newts = lwtunnel_state_alloc(struct_size(tun_encap_info, label,
n_labels));
if (!newts)
return -ENOMEM;