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net: sctp: sctp_auth_make_key_vector: remove duplicate ntohs calls

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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@redhat.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2013-02-07 01:41:39 +00:00 committed by David S. Miller
parent 85bd1798b2
commit 241448c2b8
1 changed files with 12 additions and 9 deletions
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19
net/sctp/auth.c
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@ -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);
random_len = ntohs(random->param_hdr.length);
hmacs_len = ntohs(hmacs->param_hdr.length);
if (chunks)
len += ntohs(chunks->param_hdr.length);
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;
}