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net: arc_emac: Fix use after free in arc_mdio_probe() 

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: 95b5fc03c1 ("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>
This commit is contained in:
Jianglei Nie 2022-03-09 20:18:24 +08:00 committed by Jakub Kicinski
parent 633593a808
commit bc0e610a6e
1 changed files with 3 additions and 2 deletions
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5
drivers/net/ethernet/arc/emac_mdio.c
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@ -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;