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Commit 241448c2 authored by Daniel Borkmann's avatar Daniel Borkmann Committed by David S. Miller
Browse files

net: sctp: sctp_auth_make_key_vector: remove duplicate ntohs calls 



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: default avatarDaniel Borkmann <dborkman@redhat.com>
Acked-by: default avatarNeil Horman <nhorman@tuxdriver.com>
Acked-by: default avatarVlad Yasevich <vyasevich@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 85bd1798

net/sctp/auth.c

+12 −9
Original line number Diff line number Diff line
@@ -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;

}