sctp: use the old asoc when making the cookie-ack chunk in dupcook_d

When processing a duplicate cookie-echo chunk, for case 'D', sctp will
not process the param from this chunk. It means old asoc has nothing
to be updated, and the new temp asoc doesn't have the complete info.

So there's no reason to use the new asoc when creating the cookie-ack
chunk. Otherwise, like when auth is enabled for cookie-ack, the chunk
can not be set with auth, and it will definitely be dropped by peer.

This issue is there since very beginning, and we fix it by using the
old asoc instead.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 98acfed45e3b6098cf5b92f2d1e3600dd7c5904e..28c070e187c2ed84fc531622a8090888207844ba 100644 (file)
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -2056,7 +2056,7 @@ static enum sctp_disposition sctp_sf_do_dupcook_d(
                }
        }
 
-       repl = sctp_make_cookie_ack(new_asoc, chunk);
+       repl = sctp_make_cookie_ack(asoc, chunk);
        if (!repl)
                goto nomem;