syzbot found that if __inet_inherit_port() returns an error,
we call tcp_done() after inet_csk_prepare_forced_close(),
meaning the socket lock is no longer held.
We might fix this in a different way in net-next, but
for 5.4 it seems safer to relax the lockdep check.
Fixes: d983ea6f16b8 ("tcp: add rcu protection around tp->fastopen_rsk")
Signed-off-by: Eric Dumazet <eduma...@google.com>
Reported-by: syzbot <syzkal...@googlegroups.com>
---
net/ipv4/tcp.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index
b2ac4f074e2da21db57923fda722b6d23f170de9..42187a3b82f4f6280d831c34d9ca6b7bcffc191f
100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3842,8 +3842,12 @@ void tcp_done(struct sock *sk)
{
struct request_sock *req;
- req = rcu_dereference_protected(tcp_sk(sk)->fastopen_rsk,
- lockdep_sock_is_held(sk));
+ /* We might be called with a new socket, after
+ * inet_csk_prepare_forced_close() has been called
+ * so we can not use lockdep_sock_is_held(sk)
+ */
+ req = rcu_dereference_protected(tcp_sk(sk)->fastopen_rsk, 1);
+
if (sk->sk_state == TCP_SYN_SENT || sk->sk_state == TCP_SYN_RECV)
TCP_INC_STATS(sock_net(sk), TCP_MIB_ATTEMPTFAILS);
--
2.23.0.700.g56cf767bdb-goog
