[PATCH net 1/2] net: dsa: realtek: fix out-of-bounds access

[Ahmad Fatoum]

The probe function sets priv->chip_data to (void *)priv + sizeof(*priv)
with the expectation that priv has enough trailing space.

However, only realtek-smi actually allocated this chip_data space.
Do likewise in realtek-mdio to fix out-of-bounds accesses.

Fixes: aac94001067d ("net: dsa: realtek: add new mdio interface for drivers")
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
 drivers/net/dsa/realtek/realtek-mdio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/realtek/realtek-mdio.c b/drivers/net/dsa/realtek/realtek-mdio.c
index 3e54fac5f902..3b22d3f7ad99 100644
--- a/drivers/net/dsa/realtek/realtek-mdio.c
+++ b/drivers/net/dsa/realtek/realtek-mdio.c
@@ -152,7 +152,7 @@ static int realtek_mdio_probe(struct mdio_device *mdiodev)
 	if (!var)
 		return -EINVAL;
 
-	priv = devm_kzalloc(&mdiodev->dev, sizeof(*priv), GFP_KERNEL);
+	priv = devm_kzalloc(&mdiodev->dev, sizeof(*priv) + var->chip_data_sz, GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
-- 
2.30.2