From cd26da4ff4eb7189921d4e7ad87e8adebb7b416b Mon Sep 17 00:00:00 2001 From: Xin Long 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 Acked-by: Marcelo Ricardo Leitner Signed-off-by: David S. Miller --- 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 9fbb6feb8c27..71b75f9d9c1b 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; -- 2.20.1