netdev - [PATCH v2 net-next 11/23] sit: add net device refcount tracking to ip

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Date:   Thu,  2 Dec 2021 18:46:28 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH v2 net-next 11/23] sit: add net device refcount tracking to ip_tunnel

From: Eric Dumazet <edumazet@...gle.com>

Note that other ip_tunnel users do not seem to hold a reference
on tunnel->dev. Probably needs some investigations.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/ip_tunnels.h | 3 +++
 net/ipv6/sit.c           | 4 ++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index bc3b13ec93c9dcd3f5d4c0ad8598200912172863..0219fe907b261952ec1f140d105cd74d7eda6b40 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -104,7 +104,10 @@ struct metadata_dst;
 struct ip_tunnel {
 	struct ip_tunnel __rcu	*next;
 	struct hlist_node hash_node;
+
 	struct net_device	*dev;
+	netdevice_tracker	dev_tracker;
+
 	struct net		*net;	/* netns for packet i/o */
 
 	unsigned long	err_time;	/* Time when the last ICMP error
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 1b57ee36d6682e04085aa271c6c5c09e6e3a7b7e..057c0f83c8007fb0756ca0d3a2231fab8eebaacb 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -521,7 +521,7 @@ static void ipip6_tunnel_uninit(struct net_device *dev)
 		ipip6_tunnel_del_prl(tunnel, NULL);
 	}
 	dst_cache_reset(&tunnel->dst_cache);
-	dev_put(dev);
+	dev_put_track(dev, &tunnel->dev_tracker);
 }
 
 static int ipip6_err(struct sk_buff *skb, u32 info)
@@ -1463,7 +1463,7 @@ static int ipip6_tunnel_init(struct net_device *dev)
 		dev->tstats = NULL;
 		return err;
 	}
-	dev_hold(dev);
+	dev_hold_track(dev, &tunnel->dev_tracker, GFP_KERNEL);
 	return 0;
 }
 
-- 
2.34.1.400.ga245620fadb-goog