netdev - [PATCH net-next] net: add dev->dev_registered

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Date:   Mon,  7 Feb 2022 10:41:07 -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>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next] net: add dev->dev_registered_tracker

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

Convert one dev_hold()/dev_put() pair in register_netdevice()
and unregister_netdevice_many() to dev_hold_track()
and dev_put_track().

This would allow to detect a rogue dev_put() a bit earlier.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/linux/netdevice.h | 1 +
 net/core/dev.c            | 6 ++++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 3fb6fb67ed77e70314a699c9bdf8f4b26acfcc19..cfa1e70c71e48b39ff21140392a2883223a1b839 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2282,6 +2282,7 @@ struct net_device {
 	u8 dev_addr_shadow[MAX_ADDR_LEN];
 	netdevice_tracker	linkwatch_dev_tracker;
 	netdevice_tracker	watchdog_dev_tracker;
+	netdevice_tracker	dev_registered_tracker;
 };
 #define to_net_dev(d) container_of(d, struct net_device, dev)
 
diff --git a/net/core/dev.c b/net/core/dev.c
index f662c6a7d7b49b836a05efc74aeffc7fc9e4e147..66556a21800a921d543d13ae957650ed80a7ebdd 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -9683,8 +9683,10 @@ int register_netdevice(struct net_device *dev)
 	linkwatch_init_dev(dev);
 
 	dev_init_scheduler(dev);
-	dev_hold(dev);
+
+	dev_hold_track(dev, &dev->dev_registered_tracker, GFP_KERNEL);
 	list_netdevice(dev);
+
 	add_device_randomness(dev->dev_addr, dev->addr_len);
 
 	/* If the device has permanent device address, driver should
@@ -10449,7 +10451,7 @@ void unregister_netdevice_many(struct list_head *head)
 	synchronize_net();
 
 	list_for_each_entry(dev, head, unreg_list) {
-		dev_put(dev);
+		dev_put_track(dev, &dev->dev_registered_tracker);
 		net_set_todo(dev);
 	}
 
-- 
2.35.0.263.gb82422642f-goog