[PATCH net] ipv6: Consider sk_bound_dev_if when binding a socket to an address

[David Ahern]

From: David Ahern <dsah...@gmail.com>

IPv6 does not consider if the socket is bound to a device when binding
to an address. The result is that a socket can be bound to eth0 and then
bound to the address of eth1. If the device is a VRF, the result is that
a socket can only be bound to an address in the default VRF.

Resolve by considering the device if sk_bound_dev_if is set.

This problem exists from the beginning of git history.

Signed-off-by: David Ahern <dsah...@gmail.com>
---
 net/ipv6/af_inet6.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index f0cd291034f0..0bfb6cc0a30a 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -350,6 +350,9 @@ static int __inet6_bind(struct sock *sk, struct sockaddr 
*uaddr, int addr_len,
                                        err = -EINVAL;
                                        goto out_unlock;
                                }
+                       }
+
+                       if (sk->sk_bound_dev_if) {
                                dev = dev_get_by_index_rcu(net, 
sk->sk_bound_dev_if);
                                if (!dev) {
                                        err = -ENODEV;
-- 
2.11.0