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bpf, sockmap: fix psock refcount leak in bpf_tcp_recvmsg

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In bpf_tcp_recvmsg() we first took a reference on the psock, however
once we find that there are skbs in the normal socket's receive queue
we return with processing them through tcp_recvmsg(). Problem is that
we leak the taken reference on the psock in that path. Given we don't
really do anything with the psock at this point, move the skb_queue_empty()
test before we fetch the psock to fix this case.

Fixes: 8934ce2fd0 ("bpf: sockmap redirect ingress support")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Borkmann 2018-08-24 22:08:51 +02:00 committed by Alexei Starovoitov
parent e06fa9c16c
commit 15c480efab
1 changed files with 2 additions and 3 deletions
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5
kernel/bpf/sockmap.c
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@ -912,6 +912,8 @@ static int bpf_tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
if (unlikely(flags & MSG_ERRQUEUE))
return inet_recv_error(sk, msg, len, addr_len);
if (!skb_queue_empty(&sk->sk_receive_queue))
return tcp_recvmsg(sk, msg, len, nonblock, flags, addr_len);
rcu_read_lock();
psock = smap_psock_sk(sk);
@ -922,9 +924,6 @@ static int bpf_tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
goto out;
rcu_read_unlock();
if (!skb_queue_empty(&sk->sk_receive_queue))
return tcp_recvmsg(sk, msg, len, nonblock, flags, addr_len);
lock_sock(sk);
bytes_ready:
while (copied != len) {