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

[ Upstream commit 46e16d4b956867013e0bbd7f2bad206f4aa55752 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 8ec20a64a3f8055a0c3576627c5ec5dad7e99ca8..07f8b53c3bf1e4cba6c35728741d5721d01acc41 100644 (file)
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -1959,7 +1959,7 @@ static sctp_disposition_t sctp_sf_do_dupcook_d(struct net *net,
                }
        }
 
-       repl = sctp_make_cookie_ack(new_asoc, chunk);
+       repl = sctp_make_cookie_ack(asoc, chunk);
        if (!repl)
                goto nomem;