From cd26da4ff4eb7189921d4e7ad87e8adebb7b416b Mon Sep 17 00:00:00 2001
From: Xin Long <lucien.xin@gmail.com>
Date: Mon, 31 Oct 2016 20:32:31 +0800
Subject: [PATCH] sctp: hold transport instead of assoc in sctp_diag
In sctp_transport_lookup_process(), Commit 1cceda784980 ("sctp: fix
the issue sctp_diag uses lock_sock in rcu_read_lock") moved cb() out
of rcu lock, but it put transport and hold assoc instead, and ignore
that cb() still uses transport. It may cause a use-after-free issue.
This patch is to hold transport instead of assoc there.
Fixes: 1cceda784980 ("sctp: fix the issue sctp_diag uses lock_sock in rcu_read_lock")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/sctp/socket.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 9fbb6feb8c279..71b75f9d9c1be 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4480,12 +4480,9 @@ int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
if (!transport || !sctp_transport_hold(transport))
goto out;
- sctp_association_hold(transport->asoc);
- sctp_transport_put(transport);
-
rcu_read_unlock();
err = cb(transport, p);
- sctp_association_put(transport->asoc);
+ sctp_transport_put(transport);
out:
return err;
--
2.30.2