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Date: Mon, 31 Oct 2022 14:01:16 +0800 From: Gaosheng Cui <cuigaosheng1@...wei.com> To: <andrew@...n.ch>, <hkallweit1@...il.com>, <linux@...linux.org.uk>, <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>, <afleming@...escale.com>, <buytenh@...tstofly.org>, <cuigaosheng1@...wei.com> CC: <netdev@...r.kernel.org> Subject: [PATCH] net: mdio: fix undefined behavior in bit shift for __mdiobus_register Shifting signed 32-bit value by 31 bits is undefined, so changing significant bit to unsigned. The UBSAN warning calltrace like below: UBSAN: shift-out-of-bounds in drivers/net/phy/mdio_bus.c:586:27 left shift of 1 by 31 places cannot be represented in type 'int' Call Trace: <TASK> dump_stack_lvl+0x7d/0xa5 dump_stack+0x15/0x1b ubsan_epilogue+0xe/0x4e __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c __mdiobus_register+0x49d/0x4e0 fixed_mdio_bus_init+0xd8/0x12d do_one_initcall+0x76/0x430 kernel_init_freeable+0x3b3/0x422 kernel_init+0x24/0x1e0 ret_from_fork+0x1f/0x30 </TASK> Fixes: 4fd5f812c23c ("phylib: allow incremental scanning of an mii bus") Signed-off-by: Gaosheng Cui <cuigaosheng1@...wei.com> --- drivers/net/phy/mdio_bus.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c index f82090bdf7ab..0cbd9ee87514 100644 --- a/drivers/net/phy/mdio_bus.c +++ b/drivers/net/phy/mdio_bus.c @@ -583,7 +583,7 @@ int __mdiobus_register(struct mii_bus *bus, struct module *owner) } for (i = 0; i < PHY_MAX_ADDR; i++) { - if ((bus->phy_mask & (1 << i)) == 0) { + if ((bus->phy_mask & (1U << i)) == 0) { struct phy_device *phydev; phydev = mdiobus_scan(bus, i); -- 2.25.1
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