netdev - Fw: [Bug 216195] New: Maxlinear GPY115 UBSAN: shift-out-of-bounds

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Message-ID: <20220701164506.78266ebe@hermes.local>
Date:   Fri, 1 Jul 2022 16:45:06 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>
Cc:     netdev@...r.kernel.org
Subject: Fw: [Bug 216195] New: Maxlinear GPY115 UBSAN: shift-out-of-bounds



Begin forwarded message:

Date: Fri, 01 Jul 2022 08:26:11 +0000
From: bugzilla-daemon@...nel.org
To: stephen@...workplumber.org
Subject: [Bug 216195] New: Maxlinear GPY115 UBSAN: shift-out-of-bounds


https://bugzilla.kernel.org/show_bug.cgi?id=216195

            Bug ID: 216195
           Summary: Maxlinear GPY115 UBSAN: shift-out-of-bounds
           Product: Networking
           Version: 2.5
    Kernel Version: 5.15-5.17
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: stephen@...workplumber.org
          Reporter: cedric@...espeed.nl
        Regression: No

This is related to specific (wired) Ethernet IC: Maxlinear Ethernet GPY115B
The network interface does show up in ifconfig but is not functioning, no
ip-address is assigned.

During the bootup process I get the following warning:

    UBSAN: shift-out-of-bounds in 
    /build/linux-WLUive/linux- 
    5.15.0/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:224:12
    Shift exponent 40 is too large for 32-bit type 'unsigned int'

This results in the following error:

    Maxlinear Ethernet GPY115B stmmac-3:01: gpy_config_aneg failed -110

The specific kernel I am running: 5.15.0-40-generic on Ubuntu but also tested
this with Fedora Server 36 running kernel 5.17.
Config: CONFIG_MAXLINEAR_GPHY=m
The module is installed here:
/usr/lib/modules/5.15.0-generic/kernel/drivers/net/phy/mxl-gpy.ko

Additional information:
https://askubuntu.com/questions/1416068/how-to-enable-maxlinear-phy-gpy115-drivers

Datasheet:
https://www.maxlinear.com/product/connectivity/wired/ethernet/ethernet-transceivers-phy/gpy115

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