sctp: delete the nested flexible array peer_init

This patch deletes the flexible-array peer_init[] from the structure
sctp_cookie to avoid some sparse warnings:

  # make C=2 CF="-Wflexible-array-nested" M=./net/sctp/
  net/sctp/sm_make_chunk.c: note: in included file (through include/net/sctp/sctp.h):
  ./include/net/sctp/structs.h:1588:28: warning: nested flexible array
  ./include/net/sctp/structs.h:343:28: warning: nested flexible array

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: lxin

include/net/sctp/structs.h

@@ -332,7 +332,7 @@ struct sctp_cookie {
 	 * the association TCB is re-constructed from the cookie.
 	 */
 	__u32 raw_addr_list_len;
-	struct sctp_init_chunk peer_init[];
+	/* struct sctp_init_chunk peer_init[]; */
 };
 
 

net/sctp/associola.c

@@ -1597,9 +1597,10 @@ int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *asoc,
 					 struct sctp_cookie *cookie,
 					 gfp_t gfp)
 {
-	int var_size2 = ntohs(cookie->peer_init->chunk_hdr.length);
+	struct sctp_init_chunk *peer_init = (struct sctp_init_chunk *)(cookie + 1);
+	int var_size2 = ntohs(peer_init->chunk_hdr.length);
 	int var_size3 = cookie->raw_addr_list_len;
-	__u8 *raw = (__u8 *)cookie->peer_init + var_size2;
+	__u8 *raw = (__u8 *)peer_init + var_size2;
 
 	return sctp_raw_to_bind_addrs(&asoc->base.bind_addr, raw, var_size3,
 				      asoc->ep->base.bind_addr.port, gfp);

net/sctp/sm_make_chunk.c

@@ -1707,11 +1707,11 @@ static struct sctp_cookie_param *sctp_pack_cookie(
 					 ktime_get_real());
 
 	/* Copy the peer's init packet.  */
-	memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
+	memcpy(cookie + 1, init_chunk->chunk_hdr,
 	       ntohs(init_chunk->chunk_hdr->length));
 
 	/* Copy the raw local address list of the association. */
-	memcpy((__u8 *)&cookie->c.peer_init[0] +
+	memcpy((__u8 *)(cookie + 1) +
 	       ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
 
 	if (sctp_sk(ep->base.sk)->hmac) {

net/sctp/sm_statefuns.c

@@ -794,8 +794,7 @@ enum sctp_disposition sctp_sf_do_5_1D_ce(struct net *net,
 	/* This is a brand-new association, so these are not yet side
 	 * effects--it is safe to run them here.
 	 */
-	peer_init = &chunk->subh.cookie_hdr->c.peer_init[0];
-
+	peer_init = (struct sctp_init_chunk *)(chunk->subh.cookie_hdr + 1);
 	if (!sctp_process_init(new_asoc, chunk,
 			       &chunk->subh.cookie_hdr->c.peer_addr,
 			       peer_init, GFP_ATOMIC))
@@ -1869,8 +1868,7 @@ static enum sctp_disposition sctp_sf_do_dupcook_a(
 	/* new_asoc is a brand-new association, so these are not yet
 	 * side effects--it is safe to run them here.
 	 */
-	peer_init = &chunk->subh.cookie_hdr->c.peer_init[0];
-
+	peer_init = (struct sctp_init_chunk *)(chunk->subh.cookie_hdr + 1);
 	if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init,
 			       GFP_ATOMIC))
 		goto nomem;
@@ -1990,7 +1988,7 @@ static enum sctp_disposition sctp_sf_do_dupcook_b(
 	/* new_asoc is a brand-new association, so these are not yet
 	 * side effects--it is safe to run them here.
 	 */
-	peer_init = &chunk->subh.cookie_hdr->c.peer_init[0];
+	peer_init = (struct sctp_init_chunk *)(chunk->subh.cookie_hdr + 1);
 	if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init,
 			       GFP_ATOMIC))
 		goto nomem;