tcp/dccp: fix possible race __inet_lookup_established()

[mirror_ubuntu-bionic-kernel.git] / net / ipv4 / tcp_ipv4.c

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 7ba2d4f1de39097c050bedf591834db762e46c20..3c3b544404412f84faa68c46cb0e2a624cf4b4da 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1945,13 +1945,14 @@ static void *listening_get_next(struct seq_file *seq, void *cur)
        struct tcp_iter_state *st = seq->private;
        struct net *net = seq_file_net(seq);
        struct inet_listen_hashbucket *ilb;
+       struct hlist_nulls_node *node;
        struct sock *sk = cur;
 
        if (!sk) {
 get_head:
                ilb = &tcp_hashinfo.listening_hash[st->bucket];
                spin_lock(&ilb->lock);
-               sk = sk_head(&ilb->head);
+               sk = sk_nulls_head(&ilb->nulls_head);
                st->offset = 0;
                goto get_sk;
        }
@@ -1959,9 +1960,9 @@ get_head:
        ++st->num;
        ++st->offset;
 
-       sk = sk_next(sk);
+       sk = sk_nulls_next(sk);
 get_sk:
-       sk_for_each_from(sk) {
+       sk_nulls_for_each_from(sk, node) {
                if (!net_eq(sock_net(sk), net))
                        continue;
                if (sk->sk_family == st->family)