On 1/16/19 4:00 PM, Andrew Lunn wrote:
> On Wed, Jan 16, 2019 at 11:23:33AM +0100, Johan Hovold wrote:
>> Make sure to disable and deregister the switch on late probe errors to
>> avoid use-after-free when the device-resource-managed switch is freed.
>>
>> Fixes: 14fceff4771e ("net: dsa: Add Lantiq / Intel DSA driver for vrx200")
>> Cc: stable <stable@xxxxxxxxxxxxxxx> # 4.20
>> Cc: Hauke Mehrtens <hauke@xxxxxxxxxx>
>> Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
>> ---
>> drivers/net/dsa/lantiq_gswip.c | 5 ++++-
>> 1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
>> index 693a67f45bef..b06c41c98de9 100644
>> --- a/drivers/net/dsa/lantiq_gswip.c
>> +++ b/drivers/net/dsa/lantiq_gswip.c
>> @@ -1099,7 +1099,7 @@ static int gswip_probe(struct platform_device *pdev)
>> dev_err(dev, "wrong CPU port defined, HW only supports port: %i",
>> priv->hw_info->cpu_port);
>> err = -EINVAL;
>> - goto mdio_bus;
>> + goto disable_switch;
>> }
>>
>> platform_set_drvdata(pdev, priv);
>> @@ -1109,6 +1109,9 @@ static int gswip_probe(struct platform_device *pdev)
>> (version & GSWIP_VERSION_MOD_MASK) >> GSWIP_VERSION_MOD_SHIFT);
>> return 0;
>>
>> +disable_switch:
>> + gswip_mdio_mask(priv, GSWIP_MDIO_GLOB_ENABLE, 0, GSWIP_MDIO_GLOB);
>> + dsa_unregister_switch(priv->ds);
>
> This is correct. But it would be nice if somebody in the future could
> move the disabling of the switch to the inverse of the gswip_setup()
> function to make the code symmetrical.
Should we add an uninit callback?
Hauke
