[PATCH 7.0.y 2/2] net: ethtool: phy: avoid NULL deref when PHY driver is unbound

[Sasha Levin <sashal@kernel.org>]

From: David Carlier <devnexen@gmail.com>

[ Upstream commit e3adf69f8eb121a9128c2b0029efd050d3649153 ]

phydev->drv can become NULL while the phy_device is still attached to
its net_device, namely after the PHY driver is unbound via sysfs:

	echo <mdio_id> > /sys/bus/mdio_bus/drivers/<phy_drv>/unbind

phy_remove() clears phydev->drv but doesn't call phy_detach(), so the
phy_device stays in the link topology xarray and ethnl_req_get_phydev()
still hands it back. ETHTOOL_MSG_PHY_GET then oopses on:

	rep_data->drvname = kstrdup(phydev->drv->name, GFP_KERNEL);

drvname is already treated as optional by phy_reply_size(),
phy_fill_reply() and phy_cleanup_data(), so just skip the allocation
when there is no driver bound.

Fixes: 9dd2ad5e92b9 ("net: ethtool: phy: Convert the PHY_GET command to generic phy dump")
Cc: stable@vger.kernel.org # 6.13.x
Signed-off-by: David Carlier <devnexen@gmail.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Tested-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20260509215046.107157-1-devnexen@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/ethtool/phy.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/net/ethtool/phy.c b/net/ethtool/phy.c
index cb1e0aea450f9..98392a3c34b5b 100644
--- a/net/ethtool/phy.c
+++ b/net/ethtool/phy.c
@@ -94,10 +94,12 @@ static int phy_prepare_data(const struct ethnl_req_info *req_info,
 	if (!rep_data->name)
 		return -ENOMEM;
 
-	rep_data->drvname = kstrdup(phydev->drv->name, GFP_KERNEL);
-	if (!rep_data->drvname) {
-		ret = -ENOMEM;
-		goto err_free_name;
+	if (phydev->drv) {
+		rep_data->drvname = kstrdup(phydev->drv->name, GFP_KERNEL);
+		if (!rep_data->drvname) {
+			ret = -ENOMEM;
+			goto err_free_name;
+		}
 	}
 
 	rep_data->upstream_type = pdn->upstream_type;
-- 
2.53.0