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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>
This commit is contained in:
Florian Westphal 2017-08-15 16:34:42 +02:00 committed by David S. Miller
parent 2cc7659545
commit 121622dba8
1 changed files with 6 additions and 1 deletions
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7
net/ipv6/route.c
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@ -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;