On Thu, Feb 07, 2013 at 12:41:39PM +0100, Daniel Borkmann wrote:
> Instead of calling 3 times ntohs(random->param_hdr.length), 2 times
> ntohs(hmacs->param_hdr.length), and 3 times ntohs(chunks->param_hdr.length)
> within the same function, we only call each once and store it in a
> variable.
>
> Signed-off-by: Daniel Borkmann <dborkman@xxxxxxxxxx>
> ---
> net/sctp/auth.c | 21 ++++++++++++---------
> 1 file changed, 12 insertions(+), 9 deletions(-)
>
> diff --git a/net/sctp/auth.c b/net/sctp/auth.c
> index 159b9bc..94a12de 100644
> --- a/net/sctp/auth.c
> +++ b/net/sctp/auth.c
> @@ -200,10 +200,14 @@ static struct sctp_auth_bytes *sctp_auth_make_key_vector(
> struct sctp_auth_bytes *new;
> __u32 len;
> __u32 offset = 0;
> + __u16 random_len, hmacs_len, chunks_len = 0;
>
> - len = ntohs(random->param_hdr.length) + ntohs(hmacs->param_hdr.length);
> - if (chunks)
> - len += ntohs(chunks->param_hdr.length);
> + random_len = ntohs(random->param_hdr.length);
> + hmacs_len = ntohs(hmacs->param_hdr.length);
> + if (chunks)
> + chunks_len = ntohs(chunks->param_hdr.length);
> +
> + len = random_len + hmacs_len + chunks_len;
>
> new = kmalloc(sizeof(struct sctp_auth_bytes) + len, gfp);
> if (!new)
> @@ -211,16 +215,15 @@ static struct sctp_auth_bytes *sctp_auth_make_key_vector(
>
> new->len = len;
>
> - memcpy(new->data, random, ntohs(random->param_hdr.length));
> - offset += ntohs(random->param_hdr.length);
> + memcpy(new->data, random, random_len);
> + offset += random_len;
>
> if (chunks) {
> - memcpy(new->data + offset, chunks,
> - ntohs(chunks->param_hdr.length));
> - offset += ntohs(chunks->param_hdr.length);
> + memcpy(new->data + offset, chunks, chunks_len);
> + offset += chunks_len;
> }
>
> - memcpy(new->data + offset, hmacs, ntohs(hmacs->param_hdr.length));
> + memcpy(new->data + offset, hmacs, hmacs_len);
>
> return new;
> }
> --
> 1.7.11.7
>
> --
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>
Acked-by: Neil Horman <nhorman@xxxxxxxxxxxxx>
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