netdev - [PATCH v2 net-next 07/23] net: add net device refcount tracker to dev

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Date:   Thu,  2 Dec 2021 18:46:24 -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 07/23] net: add net device refcount tracker to dev_ifsioc()

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

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/core/dev_ioctl.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
index cbab5fec64b12df9355b154bdcaa0f48701966e8..1d309a6669325ad26c59892c4e78ca14dec017d9 100644
--- a/net/core/dev_ioctl.c
+++ b/net/core/dev_ioctl.c
@@ -313,6 +313,7 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
 	int err;
 	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
 	const struct net_device_ops *ops;
+	netdevice_tracker dev_tracker;
 
 	if (!dev)
 		return -ENODEV;
@@ -381,10 +382,10 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
 			return -ENODEV;
 		if (!netif_is_bridge_master(dev))
 			return -EOPNOTSUPP;
-		dev_hold(dev);
+		dev_hold_track(dev, &dev_tracker, GFP_KERNEL);
 		rtnl_unlock();
 		err = br_ioctl_call(net, netdev_priv(dev), cmd, ifr, NULL);
-		dev_put(dev);
+		dev_put_track(dev, &dev_tracker);
 		rtnl_lock();
 		return err;
 
-- 
2.34.1.400.ga245620fadb-goog