thermal/int340x_thermal: handle data_vault when the value is ZERO_SIZE_PTR

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>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
index 80d4e06..365489b 100644 (file)
--- 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);