From: sashiko-bot@kernel.org
To: "Prashant Sengar" <prashantsengar25031@gmail.com>
Cc: linux-usb@vger.kernel.org
Subject: Re: [PATCH net v4] net: usb: lan78xx: avoid NULL PHY dereference in WoL setup
Date: Tue, 20 Oct 2026 22:36:49 +0000 [thread overview]
Message-ID: <sashiko-outbox-179552@kernel.org> (raw)
In-Reply-To: <20261020201537.2465655-1-prashantsengar25031@gmail.com>
> LAN7801 supports fixed-link configurations without an attached PHY.
> However, lan78xx_set_wol() unconditionally passes netdev->phydev
> to phy_ethtool_set_wol(), causing a NULL pointer dereference when
> a userspace WoL request reaches this path.
>
> Report no WoL capabilities when no PHY is attached, and return
> -EOPNOTSUPP from lan78xx_set_wol() before modifying the wakeup
> configuration. Keep the existing phylib WoL handling for devices
> with an attached PHY.
>
> The issue was reproduced using USB Raw Gadget and dummy_hcd in QEMU.
> An ETHTOOL_SWOL ioctl triggered a kernel Oops with the original
> driver. With this change, the PHY-less configuration no longer
> advertises unsupported WoL operations, avoiding the crash.
>
> Fixes: e110bc825897 ("net: usb: lan78xx: Convert to PHYLINK for improved PHY and MAC management")
> Signed-off-by: Prashant Sengar <prashantsengar25031@gmail.com>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261020201537.2465655-1-prashantsengar25031@gmail.com?part=1
prev parent reply other threads:[~2026-10-20 22:36 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-20 20:15 [PATCH net v4] net: usb: lan78xx: avoid NULL PHY dereference in WoL setup Prashant Sengar
2026-10-20 22:36 ` sashiko-bot [this message]
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