netdev - [Patch net] tipc: orphan sock in tipc

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Message-Id: <20180904021241.11426-2-xiyou.wangcong@gmail.com>
Date:   Mon,  3 Sep 2018 19:12:41 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     tipc-discussion@...ts.sourceforge.net,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jon Maloy <jon.maloy@...csson.com>,
        Ying Xue <ying.xue@...driver.com>
Subject: [Patch net] tipc: orphan sock in tipc_release()

Before we unlock the sock in tipc_release(), we have to
detach sk->sk_socket from sk, otherwise a parallel
tipc_sk_fill_sock_diag() could stil read it after we
free this socket.

Fixes: c30b70deb5f4 ("tipc: implement socket diagnostics for AF_TIPC")
Reported-and-tested-by: syzbot+48804b87c16588ad491d@...kaller.appspotmail.com
Cc: Jon Maloy <jon.maloy@...csson.com>
Cc: Ying Xue <ying.xue@...driver.com>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
 net/tipc/socket.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index a19b2b1c77ed..b5a6635e4dfa 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -576,6 +576,7 @@ static int tipc_release(struct socket *sock)
 	sk_stop_timer(sk, &sk->sk_timer);
 	tipc_sk_remove(tsk);
 
+	sock_orphan(sk);
 	/* Reject any messages that accumulated in backlog queue */
 	release_sock(sk);
 	tipc_dest_list_purge(&tsk->cong_links);
-- 
2.14.4