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| author | Heiner Kallweit <hkallweit1@gmail.com> | 2023-01-15 13:54:06 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-02-06 09:52:38 +0300 |
| commit | 8a7b9560a3a8eb8724888c426e05926752f73aa0 (patch) | |
| tree | 932ba1c01b0bba7f63871a651c77374b6e86054c /drivers | |
| parent | ce1e79bf31aad1168ffa504a5d3278113ad37e63 (diff) | |
| download | linux-8a7b9560a3a8eb8724888c426e05926752f73aa0.tar.xz | |
net: mdio: validate parameter addr in mdiobus_get_phy()
[ Upstream commit 867dbe784c5010a466f00a7d1467c1c5ea569c75 ]
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: 7f854420fbfe ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/phy/mdio_bus.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c index 757763735e1f..fdf8221f46fa 100644 --- a/drivers/net/phy/mdio_bus.c +++ b/drivers/net/phy/mdio_bus.c @@ -117,7 +117,12 @@ 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; |