Re: [PATCH] thermal/int340x_thermal: handle data_vault when the value is ZERO_SIZE_PTR

Rafael J. Wysocki
2022-08-23T19:16:50Z

On Mon, Aug 8, 2022 at 3:22 PM Lee, Chun-Yi <joeyli.kernel@gmail.com> wrote:
>
> In some case, the GDDV returns a package with a buffer which has
> zero length. It causes that kmemdup() returns ZERO_SIZE_PTR (0x10).
>
> Then the data_vault_read() got NULL point dereference problem when
> accessing the 0x10 value in data_vault.
>
> [ 71.024560] BUG: kernel NULL pointer dereference, address:
> 0000000000000010
>
> This patch uses ZERO_OR_NULL_PTR() for checking ZERO_SIZE_PTR or
> NULL value in data_vault.
>
> Signed-off-by: "Lee, Chun-Yi" <jlee@suse.com>

Applied as 6.0-rc material, thanks!

> ---
> drivers/thermal/intel/int340x_thermal/int3400_thermal.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> index 80d4e0676083..365489bf4b8c 100644
> --- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> +++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> @@ -527,7 +527,7 @@ static void int3400_setup_gddv(struct int3400_thermal_priv *priv)
> priv->data_vault = kmemdup(obj->package.elements[0].buffer.pointer,
> obj->package.elements[0].buffer.length,
> GFP_KERNEL);
> - if (!priv->data_vault)
> + if (ZERO_OR_NULL_PTR(priv->data_vault))
> goto out_free;
>
> bin_attr_data_vault.private = priv->data_vault;
> @@ -597,7 +597,7 @@ static int int3400_thermal_probe(struct platform_device *pdev)
> goto free_imok;
> }
>
> - if (priv->data_vault) {
> + if (!ZERO_OR_NULL_PTR(priv->data_vault)) {
> result = sysfs_create_group(&pdev->dev.kobj,
> &data_attribute_group);
> if (result)
> @@ -615,7 +615,8 @@ static int int3400_thermal_probe(struct platform_device *pdev)
> free_sysfs:
> cleanup_odvp(priv);
> if (priv->data_vault) {
> - sysfs_remove_group(&pdev->dev.kobj, &data_attribute_group);
> + if (!ZERO_OR_NULL_PTR(priv->data_vault))
> + sysfs_remove_group(&pdev->dev.kobj, &data_attribute_group);
> kfree(priv->data_vault);
> }
> free_uuid:
> @@ -647,7 +648,7 @@ static int int3400_thermal_remove(struct platform_device *pdev)
> if (!priv->rel_misc_dev_res)
> acpi_thermal_rel_misc_device_remove(priv->adev->handle);
>
> - if (priv->data_vault)
> + if (!ZERO_OR_NULL_PTR(priv->data_vault))
> sysfs_remove_group(&pdev->dev.kobj, &data_attribute_group);
> sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
> sysfs_remove_group(&pdev->dev.kobj, &imok_attribute_group);
> --
> 2.26.2
>