When IPV6_MROUTE_MULTIPLE_TABLES is enabled, calls to ip6mr_get_table()
must be done under RCU or RTNL lock.

Fixes: d1db275dd3f6 ("ipv6: ip6mr: support multiple tables")
Signed-off-by: Stefan Wiehler <stefan.wiehler@nokia.com>
---
 net/ipv6/ip6mr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index ecb9e86fe45a..b54353bee2f8 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1668,7 +1668,9 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval,
 	    inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
 		return -EOPNOTSUPP;
 
+	rcu_read_lock();
 	mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
+	rcu_read_unlock();
 	if (!mrt)
 		return -ENOENT;
 
-- 
2.42.0