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SubjectRe: [PATCH] max17042_battery: fix potential use-after-free on device remove
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Date
Hi,

On 2/15/19 11:03 PM, Sven Van Asbroeck wrote:
> The work which is scheduled on a POR boot is potentially left
> pending or running until after the device module is removed,
> which could result in a use-after-free.
>
> Fix by registering a cancel/sync callback, which gets executed as
> part of standard resource unwinding.
>
> This issue was detected with the help of Coccinelle.
>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com>

Looks good to me:

Reviewed-by: Hans de Goede <hdegoede@redhat.com>

Regards,

Hans


> ---
> drivers/power/supply/max17042_battery.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c
> index 2a8d75e5e930..581c6bd23388 100644
> --- a/drivers/power/supply/max17042_battery.c
> +++ b/drivers/power/supply/max17042_battery.c
> @@ -995,6 +995,13 @@ static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
> .num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
> };
>
> +static void max17042_stop_work(void *data)
> +{
> + struct max17042_chip *chip = data;
> +
> + cancel_work_sync(&chip->work);
> +}
> +
> static int max17042_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> @@ -1101,6 +1108,9 @@ static int max17042_probe(struct i2c_client *client,
> regmap_read(chip->regmap, MAX17042_STATUS, &val);
> if (val & STATUS_POR_BIT) {
> INIT_WORK(&chip->work, max17042_init_worker);
> + ret = devm_add_action(&client->dev, max17042_stop_work, chip);
> + if (ret)
> + return ret;
> schedule_work(&chip->work);
> } else {
> chip->init_complete = 1;
>

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