linux-kernel - [PATCH v2] sctp: check assoc before SCTP_ADDR_{MADE

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Message-Id: <20200527095640.270986-1-jonas.falkevik@gmail.com>
Date:   Wed, 27 May 2020 11:56:40 +0200
From:   Jonas Falkevik <jonas.falkevik@...il.com>
To:     marcelo.leitner@...il.com, lucien.xin@...il.com,
        nhorman@...driver.com, vyasevich@...il.com, davem@...emloft.net,
        kuba@...nel.org, linux-sctp@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Jonas Falkevik <jonas.falkevik@...il.com>
Subject: [PATCH v2] sctp: check assoc before SCTP_ADDR_{MADE_PRIM,ADDED} event

Make sure SCTP_ADDR_{MADE_PRIM,ADDED} are sent only for associations
that have been established.

These events are described in rfc6458#section-6.1
SCTP_PEER_ADDR_CHANGE:
This tag indicates that an address that is
part of an existing association has experienced a change of
state (e.g., a failure or return to service of the reachability
of an endpoint via a specific transport address).

Signed-off-by: Jonas Falkevik <jonas.falkevik@...il.com>
---
Changes in v2:
 - Check asoc state to be at least established.
   Instead of associd being SCTP_FUTURE_ASSOC.
 - Common check for all peer addr change event

 net/sctp/ulpevent.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/sctp/ulpevent.c b/net/sctp/ulpevent.c
index c82dbdcf13f2..77d5c36a8991 100644
--- a/net/sctp/ulpevent.c
+++ b/net/sctp/ulpevent.c
@@ -343,6 +343,9 @@ void sctp_ulpevent_nofity_peer_addr_change(struct sctp_transport *transport,
 	struct sockaddr_storage addr;
 	struct sctp_ulpevent *event;
 
+	if (asoc->state < SCTP_STATE_ESTABLISHED)
+		return;
+
 	memset(&addr, 0, sizeof(struct sockaddr_storage));
 	memcpy(&addr, &transport->ipaddr, transport->af_specific->sockaddr_len);
 
-- 
2.25.4