sctp: fix reporting of unknown parameters

commit 5fa782c2 re-worked the
handling of unknown parameters. sctp_init_cause_fixed() can now
return -ENOSPC if there is not enough tailroom in the error
chunk skb. When this happens, the error header is not appended to
the error chunk. In that case, the payload of the unknown parameter
should not be appended either.
Signed-off-by: Jiri Bohac <jbohac@suse.cz>
Acked-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/sm_make_chunk.c

@@ -2029,8 +2029,8 @@ static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
 			*errp = sctp_make_op_error_fixed(asoc, chunk);
 
 		if (*errp) {
-			sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
-					WORD_ROUND(ntohs(param.p->length)));
+			if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
+					WORD_ROUND(ntohs(param.p->length))))
 				sctp_addto_chunk_fixed(*errp,
 						WORD_ROUND(ntohs(param.p->length)),
 						param.v);