From: Eric Dumazet <edumazet@google.com>
Date: Sun, 5 Dec 2021 04:22:01 +0000 (-0800)
Subject: net: add net device refcount tracker to dev_ifsioc()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=14ed029b5eb5146794a46d89e114715c9d380ca1;p=linux.git

net: add net device refcount tracker to dev_ifsioc()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
index cbab5fec64b12..1d309a6669325 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;