6.6-stable review patch. If anyone has any objections, please let me know.
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From: Jakub Raczynski j.raczynski@samsung.com
[ Upstream commit 260388f79e94fb3026c419a208ece8358bb7b555 ]
When using publicly available tools like 'mdio-tools' to read/write data from/to network interface and its PHY via C45 (clause 45) mdiobus, there is no verification of parameters passed to the ioctl and it accepts any mdio address. Currently there is support for 32 addresses in kernel via PHY_MAX_ADDR define, but it is possible to pass higher value than that via ioctl. While read/write operation should generally fail in this case, mdiobus provides stats array, where wrong address may allow out-of-bounds read/write.
Fix that by adding address verification before C45 read/write operation. While this excludes this access from any statistics, it improves security of read/write operation.
Fixes: 4e4aafcddbbf ("net: mdio: Add dedicated C45 API to MDIO bus drivers") Signed-off-by: Jakub Raczynski j.raczynski@samsung.com Reported-by: Wenjing Shan wenjing.shan@samsung.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/phy/mdio_bus.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c index 103998969d44c..e02706b7cc1ed 100644 --- a/drivers/net/phy/mdio_bus.c +++ b/drivers/net/phy/mdio_bus.c @@ -946,6 +946,9 @@ int __mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum)
lockdep_assert_held_once(&bus->mdio_lock);
+ if (addr >= PHY_MAX_ADDR) + return -ENXIO; + if (bus->read_c45) retval = bus->read_c45(bus, addr, devad, regnum); else @@ -977,6 +980,9 @@ int __mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum,
lockdep_assert_held_once(&bus->mdio_lock);
+ if (addr >= PHY_MAX_ADDR) + return -ENXIO; + if (bus->write_c45) err = bus->write_c45(bus, addr, devad, regnum, val); else