[PATCH net-next] net: ethtool: phy: Don't set the context dev pointer for unfiltered DUMP

[Maxime Chevallier]

The context info allows continuing DUMP requests, shall they fill the
netlink buffer.

In the case of filtered DUMP requests, a reference on the netdev is
grabbed in the .start() callback and release in .done().

Unfiltered DUMP request don't need the dev pointer to be set in the context
info, doing so will trigger an unwanted netdev_put() in .done().

Reported-by: syzbot+e9ed4e4368d450c8f9db at syzkaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/000000000000d3bf150621d361a7@google.com/
Fixes: 17194be4c8e1 ("net: ethtool: Introduce a command to list PHYs on an interface")
Signed-off-by: Maxime Chevallier <maxime.chevallier at bootlin.com>
---
This patch fixes a commit that still lives in net-next.

 net/ethtool/phy.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/ethtool/phy.c b/net/ethtool/phy.c
index 4ef7c6e32d10..ed8f690f6bac 100644
--- a/net/ethtool/phy.c
+++ b/net/ethtool/phy.c
@@ -251,8 +251,6 @@ static int ethnl_phy_dump_one_dev(struct sk_buff *skb, struct net_device *dev,
 	int ret = 0;
 	void *ehdr;
 
-	pri->base.dev = dev;
-
 	if (!dev->link_topo)
 		return 0;
 
-- 
2.46.0