diff mbox series

[4.9,16/18] sctp: Fix SHUTDOWN CTSN Ack in the peer restart case

Message ID 20200508123034.158652178@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH May 8, 2020, 12:35 p.m. UTC 
From: Jere Leppänen <jere.leppanen@nokia.com>

commit 12dfd78e3a74825e6f0bc8df7ef9f938fbc6bfe3 upstream.

When starting shutdown in sctp_sf_do_dupcook_a(), get the value for
SHUTDOWN Cumulative TSN Ack from the new association, which is
reconstructed from the cookie, instead of the old association, which
the peer doesn't have anymore.

Otherwise the SHUTDOWN is either ignored or replied to with an ABORT
by the peer because CTSN Ack doesn't match the peer's Initial TSN.

Fixes: bdf6fa52f01b ("sctp: handle association restarts when the socket is closed.")
Signed-off-by: Jere Leppänen <jere.leppanen@nokia.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>

---
 net/sctp/sm_make_chunk.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
diff mbox series

Patch

--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -856,7 +856,11 @@  struct sctp_chunk *sctp_make_shutdown(co
 	sctp_shutdownhdr_t shut;
 	__u32 ctsn;
 
-	ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
+	if (chunk && chunk->asoc)
+		ctsn = sctp_tsnmap_get_ctsn(&chunk->asoc->peer.tsn_map);
+	else
+		ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
+
 	shut.cum_tsn_ack = htonl(ctsn);
 
 	retval = sctp_make_control(asoc, SCTP_CID_SHUTDOWN, 0,