[PATCH net v5 06/10] ip6mr: Lock RCU before ip6mr_get_table() call in ip6mr_mfc_seq_start()

[Stefan Wiehler]

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@xxxxxxxxx>
---
 net/ipv6/ip6mr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 5171d64e046b..ecb9e86fe45a 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -467,7 +467,9 @@ static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
 	struct net *net = seq_file_net(seq);
 	struct mr_table *mrt;
 
+	rcu_read_lock();
 	mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
+	rcu_read_unlock();
 	if (!mrt)
 		return ERR_PTR(-ENOENT);
 
-- 
2.42.0