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net: mdio: validate parameter addr in mdiobus_get_phy()

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The caller may pass any value as addr, what may result in an out-of-bounds
access to array mdio_map. One existing case is stmmac_init_phy() that
may pass -1 as addr. Therefore validate addr before using it.

Fixes: 7f854420fb ("phy: Add API for {un}registering an mdio device to a bus.")
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/cdf664ea-3312-e915-73f8-021678d08887@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Heiner Kallweit 2023-01-15 11:54:06 +01:00 committed by Paolo Abeni
parent ecf7cf8efb
commit 867dbe784c
1 changed files with 6 additions and 1 deletions
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7
drivers/net/phy/mdio_bus.c
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@ -108,7 +108,12 @@ EXPORT_SYMBOL(mdiobus_unregister_device);
struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr)
{
struct mdio_device *mdiodev = bus->mdio_map[addr];
struct mdio_device *mdiodev;
if (addr < 0 || addr >= ARRAY_SIZE(bus->mdio_map))
return NULL;
mdiodev = bus->mdio_map[addr];
if (!mdiodev)
return NULL;