From 241448c2b84ff02a46ce88199e05fdeb55bad449 Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Thu, 7 Feb 2013 01:41:39 +0000 Subject: [PATCH] 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: Daniel Borkmann Acked-by: Neil Horman Acked-by: Vlad Yasevich Signed-off-by: David S. Miller --- 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 159b9bc5d633..94a12de58691 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; } -- 2.20.1