[net-next PATCH 1/2] bpf: sockmap state change warning fix

[John Fastabend <john.fastabend@gmail.com>]

psock will uninitialized in default case we need to do the same psock lookup
and check as in other branch. Fixes compile warning below.

kernel/bpf/sockmap.c: In function ‘smap_state_change’:
kernel/bpf/sockmap.c:156:21: warning: ‘psock’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  struct smap_psock *psock;

Fixes: 174a79ff9515 ("bpf: sockmap with sk redirect support")
Reported-by: David Miller <davem@davemloft.net>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
---
 kernel/bpf/sockmap.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/bpf/sockmap.c b/kernel/bpf/sockmap.c
index 792f0ad..f7e5e6c 100644
--- a/kernel/bpf/sockmap.c
+++ b/kernel/bpf/sockmap.c
@@ -188,6 +188,9 @@ static void smap_state_change(struct sock *sk)
 			smap_release_sock(sk);
 		break;
 	default:
+		psock = smap_psock_sk(sk);
+		if (unlikely(!psock))
+			break;
 		smap_report_sk_error(psock, EPIPE);
 		break;
 	}