[PATCH 4.10 16/63] geneve: lock RCU on TX path

[Greg Kroah-Hartman]

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

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

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


[ Upstream commit a717e3f740803cc88bd5c9a70c93504f6a368663 ]

There is no guarantees that callers of the TX path will hold
the RCU lock.  Grab it explicitly.

Fixes: fceb9c3e3825 ("geneve: avoid using stale geneve 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/geneve.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -881,12 +881,14 @@ static netdev_tx_t geneve_xmit(struct sk
                info = &geneve->info;
        }
 
+       rcu_read_lock();
 #if IS_ENABLED(CONFIG_IPV6)
        if (info->mode & IP_TUNNEL_INFO_IPV6)
                err = geneve6_xmit_skb(skb, dev, geneve, info);
        else
 #endif
                err = geneve_xmit_skb(skb, dev, geneve, info);
+       rcu_read_unlock();
 
        if (likely(!err))
                return NETDEV_TX_OK;