linux-kernel - Re: [PATCH net-next v2 1/1] net: phy: at803x: fix NULL pointer dereference on AR9331 PHY

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Date:   Fri, 17 Jun 2022 19:42:15 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 1/1] net: phy: at803x: fix NULL pointer
 dereference on AR9331 PHY

On Fri, Jun 17, 2022 at 06:59:43AM +0200, Oleksij Rempel wrote:
> Latest kernel will explode on the PHY interrupt config, since it depends
> now on allocated priv. So, run probe to allocate priv to fix it.
> 
>  ar9331_switch ethernet.1:10 lan0 (uninitialized): PHY [!ahb!ethernet@...00000!mdio!switch@10:00] driver [Qualcomm Atheros AR9331 built-in PHY] (irq=13)
>  CPU 0 Unable to handle kernel paging request at virtual address 0000000a, epc == 8050e8a8, ra == 80504b34
>          ...
>  Call Trace:
>  [<8050e8a8>] at803x_config_intr+0x5c/0xd0
>  [<80504b34>] phy_request_interrupt+0xa8/0xd0
>  [<8050289c>] phylink_bringup_phy+0x2d8/0x3ac
>  [<80502b68>] phylink_fwnode_phy_connect+0x118/0x130
>  [<8074d8ec>] dsa_slave_create+0x270/0x420
>  [<80743b04>] dsa_port_setup+0x12c/0x148
>  [<8074580c>] dsa_register_switch+0xaf0/0xcc0
>  [<80511344>] ar9331_sw_probe+0x370/0x388
>  [<8050cb78>] mdio_probe+0x44/0x70
>  [<804df300>] really_probe+0x200/0x424
>  [<804df7b4>] __driver_probe_device+0x290/0x298
>  [<804df810>] driver_probe_device+0x54/0xe4
>  [<804dfd50>] __device_attach_driver+0xe4/0x130
>  [<804dcb00>] bus_for_each_drv+0xb4/0xd8
>  [<804dfac4>] __device_attach+0x104/0x1a4
>  [<804ddd24>] bus_probe_device+0x48/0xc4
>  [<804deb44>] deferred_probe_work_func+0xf0/0x10c
>  [<800a0ffc>] process_one_work+0x314/0x4d4
>  [<800a17fc>] worker_thread+0x2a4/0x354
>  [<800a9a54>] kthread+0x134/0x13c
>  [<8006306c>] ret_from_kernel_thread+0x14/0x1c
> 
> Same Issue would affect some other PHYs (QCA8081, QCA9561), so fix it
> too.
> 
> Fixes: 3265f4218878 ("net: phy: at803x: add fiber support")
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew