ipv6: route: make rtm_getroute not assume rtnl is locked
__dev_get_by_index assumes RTNL is held, use _rcu version instead.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 6793135..60705b4 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3611,8 +3611,11 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct net_device *dev;
int flags = 0;
- dev = __dev_get_by_index(net, iif);
+ rcu_read_lock();
+
+ dev = dev_get_by_index_rcu(net, iif);
if (!dev) {
+ rcu_read_unlock();
err = -ENODEV;
goto errout;
}
@@ -3624,6 +3627,8 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
if (!fibmatch)
dst = ip6_route_input_lookup(net, dev, &fl6, flags);
+
+ rcu_read_unlock();
} else {
fl6.flowi6_oif = oif;
