[PATCH 4.9 11/93] vxlan: lock RCU on TX path

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jakub Kicinski <jakub.kicin...@netronome.com>


[ Upstream commit 56de859e9967c070464a9a9f4f18d73f9447298e ]

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.kicin...@netronome.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/vxlan.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1955,6 +1955,7 @@ static void vxlan_xmit_one(struct sk_buf
 
        info = skb_tunnel_info(skb);
 
+       rcu_read_lock();
        if (rdst) {
                dst_port = rdst->remote_port ? rdst->remote_port : 
vxlan->cfg.dst_port;
                vni = rdst->remote_vni;
@@ -1985,7 +1986,7 @@ static void vxlan_xmit_one(struct sk_buf
                if (did_rsc) {
                        /* short-circuited back to local bridge */
                        vxlan_encap_bypass(skb, vxlan, vxlan);
-                       return;
+                       goto out_unlock;
                }
                goto drop;
        }
@@ -2054,7 +2055,7 @@ static void vxlan_xmit_one(struct sk_buf
                        if (!dst_vxlan)
                                goto tx_error;
                        vxlan_encap_bypass(skb, vxlan, dst_vxlan);
-                       return;
+                       goto out_unlock;
                }
 
                if (!info)
@@ -2115,7 +2116,7 @@ static void vxlan_xmit_one(struct sk_buf
                        if (!dst_vxlan)
                                goto tx_error;
                        vxlan_encap_bypass(skb, vxlan, dst_vxlan);
-                       return;
+                       goto out_unlock;
                }
 
                if (!info)
@@ -2129,7 +2130,7 @@ static void vxlan_xmit_one(struct sk_buf
                if (err < 0) {
                        dst_release(ndst);
                        dev->stats.tx_errors++;
-                       return;
+                       goto out_unlock;
                }
                udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
                                     &local_ip.sin6.sin6_addr,
@@ -2137,7 +2138,8 @@ static void vxlan_xmit_one(struct sk_buf
                                     label, src_port, dst_port, !udp_sum);
 #endif
        }
-
+out_unlock:
+       rcu_read_unlock();
        return;
 
 drop:
@@ -2153,6 +2155,7 @@ tx_error:
        dev->stats.tx_errors++;
 tx_free:
        dev_kfree_skb(skb);
+       rcu_read_unlock();
 }
 
 /* Transmit local packets over Vxlan