net: usb: asix: validate PHY address before use

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[ Upstream commit a1e077a3f7 ]

The ASIX driver reads the PHY address from the USB device via
asix_read_phy_addr(). A malicious or faulty device can return an
invalid address (>= PHY_MAX_ADDR), which causes a warning in
mdiobus_get_phy():

  addr 207 out of range
  WARNING: drivers/net/phy/mdio_bus.c:76

Validate the PHY address in asix_read_phy_addr() and remove the
now-redundant check in ax88172a.c.

Reported-by: syzbot+3d43c9066a5b54902232@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=3d43c9066a5b54902232
Tested-by: syzbot+3d43c9066a5b54902232@syzkaller.appspotmail.com
Fixes: 7e88b11a86 ("net: usb: asix: refactor asix_read_phy_addr() and handle errors on return")
Link: https://lore.kernel.org/all/20251217085057.270704-1-kartikey406@gmail.com/T/ [v1]
Signed-off-by: Deepanshu Kartikey <kartikey406@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20251218011156.276824-1-kartikey406@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Deepanshu Kartikey 2025-12-18 06:41:56 +05:30 • committed by Greg Kroah-Hartman

parent b3c214ac51

commit fc96018f09

1 changed files with 5 additions and 0 deletions

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drivers/net/usb/asix_common.c

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