linux-kernel - Re: [syzbot] [usb?] UBSAN: shift-out-of-bounds in ax88772

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Message-ID: <20250818040521.604-1-yuichtsu@amazon.com>
Date: Mon, 18 Aug 2025 13:05:21 +0900
From: Yuichiro Tsuji <yuichtsu@...zon.com>
To: <syzbot+20537064367a0f98d597@...kaller.appspotmail.com>
CC: <linux-kernel@...r.kernel.org>, <syzkaller-bugs@...glegroups.com>
Subject: Re: [syzbot] [usb?] UBSAN: shift-out-of-bounds in ax88772_bind

#syz test

diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c index d9f5942ccc44..792ddda1ad49 100644
--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -676,7 +676,7 @@ static int ax88772_init_mdio(struct usbnet *dev)
 	priv->mdio->read = &asix_mdio_bus_read;
 	priv->mdio->write = &asix_mdio_bus_write;
 	priv->mdio->name = "Asix MDIO Bus";
-	priv->mdio->phy_mask = ~(BIT(priv->phy_addr) | BIT(AX_EMBD_PHY_ADDR));
+	priv->mdio->phy_mask = ~(BIT(priv->phy_addr & 0x1f) | 
+BIT(AX_EMBD_PHY_ADDR));
 	/* mii bus name is usb-<usb bus number>-<usb device number> */
 	snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "usb-%03d:%03d",
 		 dev->udev->bus->busnum, dev->udev->devnum);