Commit 56de859e authored by Jakub Kicinski's avatar Jakub Kicinski Committed by David S. Miller

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: c6fcc4fc ("vxlan: avoid using stale vxlan socket.")
Signed-off-by: default avatarJakub Kicinski <[email protected]>
Signed-off-by: default avatarDavid S. Miller <[email protected]>
parent 39e6c820
......@@ -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 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
return;
tx_error:
rcu_read_unlock();
if (err == -ELOOP)
dev->stats.collisions++;
else if (err == -ENETUNREACH)
......
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