unix/caif: sk_socket can disappear when state is unlocked

[mirror_ubuntu-bionic-kernel.git] / net / unix / af_unix.c

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 5266ea7b922b76d1977dea57cc7c227594c49285..06430598cf512fdaff480671620e8fa69c259bb5 100644 (file)
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1880,6 +1880,10 @@ static long unix_stream_data_wait(struct sock *sk, long timeo,
                unix_state_unlock(sk);
                timeo = freezable_schedule_timeout(timeo);
                unix_state_lock(sk);
+
+               if (sock_flag(sk, SOCK_DEAD))
+                       break;
+
                clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
        }
 
@@ -1939,6 +1943,10 @@ static int unix_stream_recvmsg(struct socket *sock, struct msghdr *msg,
                struct sk_buff *skb, *last;
 
                unix_state_lock(sk);
+               if (sock_flag(sk, SOCK_DEAD)) {
+                       err = -ECONNRESET;
+                       goto unlock;
+               }
                last = skb = skb_peek(&sk->sk_receive_queue);
 again:
                if (skb == NULL) {