[PATCH 4.20 008/127] ipv6: Take rcu_read_lock in __inet6_bind for mapped addresses

[Greg Kroah-Hartman]

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Ahern <dsahern@xxxxxxxxx>

[ Upstream commit d4a7e9bb74b5aaf07b89f6531c080b1130bdf019 ]

I realized the last patch calls dev_get_by_index_rcu in a branch not
holding the rcu lock. Add the calls to rcu_read_lock and rcu_read_unlock.

Fixes: ec90ad334986 ("ipv6: Consider sk_bound_dev_if when binding a socket to a v4 mapped address")
Signed-off-by: David Ahern <dsahern@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/ipv6/af_inet6.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -321,17 +321,20 @@ static int __inet6_bind(struct sock *sk,
 			goto out;
 		}
 
+		rcu_read_lock();
 		if (sk->sk_bound_dev_if) {
 			dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 			if (!dev) {
 				err = -ENODEV;
-				goto out;
+				goto out_unlock;
 			}
 		}
 
 		/* Reproduce AF_INET checks to make the bindings consistent */
 		v4addr = addr->sin6_addr.s6_addr32[3];
 		chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
+		rcu_read_unlock();
+
 		if (!inet_can_nonlocal_bind(net, inet) &&
 		    v4addr != htonl(INADDR_ANY) &&
 		    chk_addr_ret != RTN_LOCAL &&