On Mon, Apr 23, 2018 at 03:10:58PM +0100, Adam Thomson wrote:
> Currently there's no error checking of this parameter in the
> registration function and it's blindly added to psy class and
> subsequently used as is. For example if this is NULL the call
> to psy_register_thermal() will try to dereference the pointer
> thus causing a kernel dump.
>
> This commit updates the registration code to add some basic
> checks on the desc pointer validity, name, and presence of
> properties.
>
> Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@xxxxxxxxxxx>
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> ---
> drivers/power/supply/power_supply_core.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
> index feac7b0..a7984af 100644
> --- a/drivers/power/supply/power_supply_core.c
> +++ b/drivers/power/supply/power_supply_core.c
> @@ -849,6 +849,9 @@ static void psy_unregister_cooler(struct power_supply *psy)
> pr_warn("%s: Expected proper parent device for '%s'\n",
> __func__, desc->name);
>
> + if (!desc || !desc->name || !desc->properties || !desc->num_properties)
> + return ERR_PTR(-EINVAL);
> +
> psy = kzalloc(sizeof(*psy), GFP_KERNEL);
> if (!psy)
> return ERR_PTR(-ENOMEM);
--
heikki
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