linux-kernel - [PATCH net-next 01/19] rxrpc: Check the source of a packet to a client conn

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Message-ID: <146729584902.26306.1074452400081031592.stgit@warthog.procyon.org.uk>
Date:	Thu, 30 Jun 2016 15:10:49 +0100
From:	David Howells <dhowells@...hat.com>
To:	davem@...emloft.net
Cc:	dhowells@...hat.com, netdev@...r.kernel.org,
	linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 01/19] rxrpc: Check the source of a packet to a
 client conn

When looking up a client connection to which to route a packet, we need to
check that the packet came from the correct source so that a peer can't try
to muck around with another peer's connection.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 net/rxrpc/conn_object.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/rxrpc/conn_object.c b/net/rxrpc/conn_object.c
index 4bfad7cf96cb..9381938187ac 100644
--- a/net/rxrpc/conn_object.c
+++ b/net/rxrpc/conn_object.c
@@ -509,7 +509,9 @@ struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_local *local,
 		}
 	} else {
 		conn = idr_find(&rxrpc_client_conn_ids, cid >> RXRPC_CIDSHIFT);
-		if (conn && conn->proto.epoch == epoch)
+		if (conn &&
+		    conn->proto.epoch == epoch &&
+		    conn->params.peer == peer)
 			goto found;
 	}