On Mon, Aug 18, 2025 at 05:45:07PM +0900, Yuichiro Tsuji wrote:
> Syzbot reported shift-out-of-bounds exception on MDIO bus initialization.
>
> The PHY address should be masked to 5 bits (0-31). Without this
> mask, invalid PHY addresses could be used, potentially causing issues
> with MDIO bus operations.
>
> Fix this by masking the PHY address with 0x1f (31 decimal) to ensure
> it stays within the valid range.
>
> Fixes: 4faff70959d5 ("net: usb: asix_devices: add phy_mask for ax88772 mdio bus")
> Reported-by: syzbot+20537064367a0f98d597@xxxxxxxxxxxxxxxxxxxxxxxxx
> Closes: https://syzkaller.appspot.com/bug?extid=20537064367a0f98d597
> Tested-by: syzbot+20537064367a0f98d597@xxxxxxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Yuichiro Tsuji <yuichtsu@xxxxxxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
Andrew
