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authorJakub Kicinski <jakub.kicinski@netronome.com>2017-02-24 11:43:36 -0800
committerDavid S. Miller <davem@davemloft.net>2017-03-01 09:58:31 -0800
commit56de859e9967c070464a9a9f4f18d73f9447298e (patch)
treeb24576537ac94fd5b7924df2b1713811749b7b60
parent39e6c8208d7b6fb9d2047850fb3327db567b564b (diff)
vxlan: lock RCU on TX path
There is no guarantees that callers of the TX path will hold the RCU lock. Grab it explicitly. Fixes: c6fcc4fc5f8b ("vxlan: avoid using stale vxlan socket.") Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/vxlan.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index b7911994112a..e375560cc74e 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2105,6 +2105,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
vxlan->cfg.port_max, true);
+ rcu_read_lock();
if (dst->sa.sa_family == AF_INET) {
struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
struct rtable *rt;
@@ -2127,7 +2128,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
dst_port, vni, &rt->dst,
rt->rt_flags);
if (err)
- return;
+ goto out_unlock;
} else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
df = htons(IP_DF);
}
@@ -2166,7 +2167,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
dst_port, vni, ndst,
rt6i_flags);
if (err)
- return;
+ goto out_unlock;
}
tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
@@ -2183,6 +2184,8 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
label, src_port, dst_port, !udp_sum);
#endif
}
+out_unlock:
+ rcu_read_unlock();
return;
drop:
@@ -2191,6 +2194,7 @@ drop:
return;
tx_error:
+ rcu_read_unlock();
if (err == -ELOOP)
dev->stats.collisions++;
else if (err == -ENETUNREACH)