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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 nfp_tun_active_tuns {
...
struct route_ip_info {
__be32 ipv4;
__be32 egress_port;
__be32 extra[2];
} tun_info[];
};
Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.
So, replace the following form:
sizeof(struct nfp_tun_active_tuns) + sizeof(struct route_ip_info) * count
with:
struct_size(payload, tun_info, count)
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
856e6d9f9d