[SCTP]: Do not include ABORT chunk header in the notification.

The socket API draft is unclear about whether to include the
chunk header or not.  Recent discussion on the sctp implementors
mailing list clarified that the chunk header shouldn't be included,
but the error parameter header still needs to be there.
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/ulpevent.c

@@ -141,11 +141,6 @@ struct sctp_ulpevent  *sctp_ulpevent_make_assoc_change(
 	 * an ABORT, so we need to include it in the sac_info.
 	 */
 	if (chunk) {
-		/* sctp_inqu_pop() has allready pulled off the chunk
-		 * header.  We need to put it back temporarily
-		 */
-		skb_push(chunk->skb, sizeof(sctp_chunkhdr_t));
-
 		/* Copy the chunk data to a new skb and reserve enough
 		 * head room to use as notification.
 		 */
@@ -155,9 +150,6 @@ struct sctp_ulpevent  *sctp_ulpevent_make_assoc_change(
 		if (!skb)
 			goto fail;
 
-		/* put back the chunk header now that we have a copy */
-		skb_pull(chunk->skb, sizeof(sctp_chunkhdr_t));
-
 		/* Embed the event fields inside the cloned skb.  */
 		event = sctp_skb2event(skb);
 		sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
@@ -168,7 +160,8 @@ struct sctp_ulpevent  *sctp_ulpevent_make_assoc_change(
 
 		/* Trim the buffer to the right length.  */
 		skb_trim(skb, sizeof(struct sctp_assoc_change) +
-			 ntohs(chunk->chunk_hdr->length));
+			 ntohs(chunk->chunk_hdr->length) -
+			 sizeof(sctp_chunkhdr_t));
 	} else {
 		event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change),
 				  MSG_NOTIFICATION, gfp);