[PATCH 5.16 057/121] net: arc_emac: Fix use after free in arc_mdio_probe()

Greg Kroah-Hartman
2022-03-14T12:26:18Z

From: Jianglei Nie <niejianglei2021@163.com>

[ Upstream commit bc0e610a6eb0d46e4123fafdbe5e6141d9fff3be ]

If bus->state is equal to MDIOBUS_ALLOCATED, mdiobus_free(bus) will free
the "bus". But bus->name is still used in the next line, which will lead
to a use after free.

We can fix it by putting the name in a local variable and make the
bus->name point to the rodata section "name",then use the name in the
error message without referring to bus to avoid the uaf.

Fixes: 95b5fc03c189 ("net: arc_emac: Make use of the helper function dev_err_probe()")
Signed-off-by: Jianglei Nie <niejianglei2021@163.com>
Link: https://lore.kernel.org/r/20220309121824.36529-1-niejianglei2021@163.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/arc/emac_mdio.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/arc/emac_mdio.c b/drivers/net/ethernet/arc/emac_mdio.c
index 9acf589b1178..87f40c2ba904 100644
--- a/drivers/net/ethernet/arc/emac_mdio.c
+++ b/drivers/net/ethernet/arc/emac_mdio.c
@@ -132,6 +132,7 @@ int arc_mdio_probe(struct arc_emac_priv *priv)
{
struct arc_emac_mdio_bus_data *data = &priv->bus_data;
struct device_node *np = priv->dev->of_node;
+ const char *name = "Synopsys MII Bus";
struct mii_bus *bus;
int error;

@@ -142,7 +143,7 @@ int arc_mdio_probe(struct arc_emac_priv *priv)
priv->bus = bus;
bus->priv = priv;
bus->parent = priv->dev;
- bus->name = "Synopsys MII Bus";
+ bus->name = name;
bus->read = &arc_mdio_read;
bus->write = &arc_mdio_write;
bus->reset = &arc_mdio_reset;
@@ -167,7 +168,7 @@ int arc_mdio_probe(struct arc_emac_priv *priv)
if (error) {
mdiobus_free(bus);
return dev_err_probe(priv->dev, error,
- "cannot register MDIO bus %s\n", bus->name);
+ "cannot register MDIO bus %s\n", name);
}

return 0;
--
2.34.1