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net: core: add READ_ONCE/WRITE_ONCE annotations for sk->sk_bound_dev_if
sock_bindtoindex_locked() needs to use WRITE_ONCE(sk->sk_bound_dev_if, val), because other cpus/threads might locklessly read this field. sock_getbindtodevice(), sock_getsockopt() need READ_ONCE() because they run without socket lock held. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -635,7 +635,9 @@ static int sock_bindtoindex_locked(struct sock *sk, int ifindex)
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if (ifindex < 0)
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goto out;
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sk->sk_bound_dev_if = ifindex;
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/* Paired with all READ_ONCE() done locklessly. */
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WRITE_ONCE(sk->sk_bound_dev_if, ifindex);
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if (sk->sk_prot->rehash)
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sk->sk_prot->rehash(sk);
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sk_dst_reset(sk);
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@ -713,10 +715,11 @@ static int sock_getbindtodevice(struct sock *sk, char __user *optval,
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{
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int ret = -ENOPROTOOPT;
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#ifdef CONFIG_NETDEVICES
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int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
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struct net *net = sock_net(sk);
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char devname[IFNAMSIZ];
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if (sk->sk_bound_dev_if == 0) {
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if (bound_dev_if == 0) {
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len = 0;
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goto zero;
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}
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@ -725,7 +728,7 @@ static int sock_getbindtodevice(struct sock *sk, char __user *optval,
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if (len < IFNAMSIZ)
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goto out;
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ret = netdev_get_name(net, devname, sk->sk_bound_dev_if);
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ret = netdev_get_name(net, devname, bound_dev_if);
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if (ret)
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goto out;
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@ -1861,7 +1864,7 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
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break;
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case SO_BINDTOIFINDEX:
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v.val = sk->sk_bound_dev_if;
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v.val = READ_ONCE(sk->sk_bound_dev_if);
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break;
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case SO_NETNS_COOKIE:
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