diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 509e9426a056..e3e44237de1c 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -857,7 +857,11 @@ struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
 	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,