[PATCH v2] platform/x86: dell-wmi-sysman: Make populate_foo_data functions more robust

From: Prasanth KSR
Date: Wed May 12 2021 - 06:26:18 EST

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1. Check acpi type before assignment of each property value

2. Add boundary check for properties count

Co-developed-by: Divya Bharathi <divya.bharathi@xxxxxxxx>
Signed-off-by: Divya Bharathi <divya.bharathi@xxxxxxxx>
Signed-off-by: Prasanth KSR <prasanth.ksr@xxxxxxxx>

Changes from v1 to v2:
- added a missed boundary check for enum next object
- removed the fix for errors reported by checkpatch as it is unrelated to this patch
---
.../dell/dell-wmi-sysman/dell-wmi-sysman.h | 5 ++-
.../dell/dell-wmi-sysman/enum-attributes.c | 39 ++++++++++++++++---
.../x86/dell/dell-wmi-sysman/int-attributes.c | 16 ++++++++
.../dell/dell-wmi-sysman/passobj-attributes.c | 6 +++
.../dell/dell-wmi-sysman/string-attributes.c | 16 +++++++-
.../x86/dell/dell-wmi-sysman/sysman.c | 3 +-
6 files changed, 77 insertions(+), 8 deletions(-)

diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/dell-wmi-sysman.h b/drivers/platform/x86/dell/dell-wmi-sysman/dell-wmi-sysman.h
index b80f2a62ea3f..3ad33a094588 100644
--- a/drivers/platform/x86/dell/dell-wmi-sysman/dell-wmi-sysman.h
+++ b/drivers/platform/x86/dell/dell-wmi-sysman/dell-wmi-sysman.h
@@ -152,12 +152,15 @@ static ssize_t curr_val##_store(struct kobject *kobj, \
return ret ? ret : count; \
}

+#define check_property_type(attr, prop, valuetype) \
+ (attr##_obj[prop].type != valuetype)
+
union acpi_object *get_wmiobj_pointer(int instance_id, const char *guid_string);
int get_instance_count(const char *guid_string);
void strlcpy_attr(char *dest, char *src);

int populate_enum_data(union acpi_object *enumeration_obj, int instance_id,
- struct kobject *attr_name_kobj);
+ struct kobject *attr_name_kobj, u32 enum_property_count);
int alloc_enum_data(void);
void exit_enum_attributes(void);

diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/enum-attributes.c b/drivers/platform/x86/dell/dell-wmi-sysman/enum-attributes.c
index 091e48c217ed..8cc212c85266 100644
--- a/drivers/platform/x86/dell/dell-wmi-sysman/enum-attributes.c
+++ b/drivers/platform/x86/dell/dell-wmi-sysman/enum-attributes.c
@@ -132,39 +132,68 @@ int alloc_enum_data(void)
* @enumeration_obj: ACPI object with enumeration data
* @instance_id: The instance to enumerate
* @attr_name_kobj: The parent kernel object
+ * @enum_property_count: Total properties count under enumeration type
*/
int populate_enum_data(union acpi_object *enumeration_obj, int instance_id,
- struct kobject *attr_name_kobj)
+ struct kobject *attr_name_kobj, u32 enum_property_count)
{
int i, next_obj, value_modifier_count, possible_values_count;

wmi_priv.enumeration_data[instance_id].attr_name_kobj = attr_name_kobj;
+ if (check_property_type(enumeration, ATTR_NAME, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.enumeration_data[instance_id].attribute_name,
enumeration_obj[ATTR_NAME].string.pointer);
+ if (check_property_type(enumeration, DISPL_NAME_LANG_CODE, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name_language_code,
enumeration_obj[DISPL_NAME_LANG_CODE].string.pointer);
+ if (check_property_type(enumeration, DISPLAY_NAME, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name,
enumeration_obj[DISPLAY_NAME].string.pointer);
+ if (check_property_type(enumeration, DEFAULT_VAL, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.enumeration_data[instance_id].default_value,
enumeration_obj[DEFAULT_VAL].string.pointer);
+ if (check_property_type(enumeration, MODIFIER, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.enumeration_data[instance_id].dell_modifier,
enumeration_obj[MODIFIER].string.pointer);

next_obj = MODIFIER + 1;

- value_modifier_count = (uintptr_t)enumeration_obj[next_obj].string.pointer;
+ if (next_obj >= enum_property_count)
+ return -EINVAL;
+
+ if (check_property_type(enumeration, next_obj, ACPI_TYPE_INTEGER))
+ return -EINVAL;
+ value_modifier_count = (uintptr_t)enumeration_obj[next_obj++].string.pointer;

for (i = 0; i < value_modifier_count; i++) {
+ if (next_obj >= enum_property_count)
+ return -EINVAL;
+ if (check_property_type(enumeration, next_obj, ACPI_TYPE_STRING))
+ return -EINVAL;
strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier,
- enumeration_obj[++next_obj].string.pointer);
+ enumeration_obj[next_obj++].string.pointer);
strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier, ";");
}

- possible_values_count = (uintptr_t) enumeration_obj[++next_obj].string.pointer;
+ if (next_obj >= enum_property_count)
+ return -EINVAL;
+
+ if (check_property_type(enumeration, next_obj, ACPI_TYPE_INTEGER))
+ return -EINVAL;
+ possible_values_count = (uintptr_t) enumeration_obj[next_obj++].string.pointer;

for (i = 0; i < possible_values_count; i++) {
+ if (next_obj >= enum_property_count)
+ return -EINVAL;
+ if (check_property_type(enumeration, next_obj, ACPI_TYPE_STRING))
+ return -EINVAL;
strcat(wmi_priv.enumeration_data[instance_id].possible_values,
- enumeration_obj[++next_obj].string.pointer);
+ enumeration_obj[next_obj++].string.pointer);
strcat(wmi_priv.enumeration_data[instance_id].possible_values, ";");
}

diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c b/drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c
index 8a49ba6e44f9..951e75b538fa 100644
--- a/drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c
+++ b/drivers/platform/x86/dell/dell-wmi-sysman/int-attributes.c
@@ -141,20 +141,36 @@ int populate_int_data(union acpi_object *integer_obj, int instance_id,
struct kobject *attr_name_kobj)
{
wmi_priv.integer_data[instance_id].attr_name_kobj = attr_name_kobj;
+ if (check_property_type(integer, ATTR_NAME, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.integer_data[instance_id].attribute_name,
integer_obj[ATTR_NAME].string.pointer);
+ if (check_property_type(integer, DISPL_NAME_LANG_CODE, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.integer_data[instance_id].display_name_language_code,
integer_obj[DISPL_NAME_LANG_CODE].string.pointer);
+ if (check_property_type(integer, DISPLAY_NAME, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.integer_data[instance_id].display_name,
integer_obj[DISPLAY_NAME].string.pointer);
+ if (check_property_type(integer, DEFAULT_VAL, ACPI_TYPE_INTEGER))
+ return -EINVAL;
wmi_priv.integer_data[instance_id].default_value =
(uintptr_t)integer_obj[DEFAULT_VAL].string.pointer;
+ if (check_property_type(integer, MODIFIER, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.integer_data[instance_id].dell_modifier,
integer_obj[MODIFIER].string.pointer);
+ if (check_property_type(integer, MIN_VALUE, ACPI_TYPE_INTEGER))
+ return -EINVAL;
wmi_priv.integer_data[instance_id].min_value =
(uintptr_t)integer_obj[MIN_VALUE].string.pointer;
+ if (check_property_type(integer, MAX_VALUE, ACPI_TYPE_INTEGER))
+ return -EINVAL;
wmi_priv.integer_data[instance_id].max_value =
(uintptr_t)integer_obj[MAX_VALUE].string.pointer;
+ if (check_property_type(integer, SCALAR_INCR, ACPI_TYPE_INTEGER))
+ return -EINVAL;
wmi_priv.integer_data[instance_id].scalar_increment =
(uintptr_t)integer_obj[SCALAR_INCR].string.pointer;

diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/passobj-attributes.c b/drivers/platform/x86/dell/dell-wmi-sysman/passobj-attributes.c
index 834b3e82ad9f..230e6ee96636 100644
--- a/drivers/platform/x86/dell/dell-wmi-sysman/passobj-attributes.c
+++ b/drivers/platform/x86/dell/dell-wmi-sysman/passobj-attributes.c
@@ -159,10 +159,16 @@ int alloc_po_data(void)
int populate_po_data(union acpi_object *po_obj, int instance_id, struct kobject *attr_name_kobj)
{
wmi_priv.po_data[instance_id].attr_name_kobj = attr_name_kobj;
+ if (check_property_type(po, ATTR_NAME, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.po_data[instance_id].attribute_name,
po_obj[ATTR_NAME].string.pointer);
+ if (check_property_type(po, MIN_PASS_LEN, ACPI_TYPE_INTEGER))
+ return -EINVAL;
wmi_priv.po_data[instance_id].min_password_length =
(uintptr_t)po_obj[MIN_PASS_LEN].string.pointer;
+ if (check_property_type(po, MAX_PASS_LEN, ACPI_TYPE_INTEGER))
+ return -EINVAL;
wmi_priv.po_data[instance_id].max_password_length =
(uintptr_t) po_obj[MAX_PASS_LEN].string.pointer;

diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/string-attributes.c b/drivers/platform/x86/dell/dell-wmi-sysman/string-attributes.c
index 552537852459..c392f0ecf8b5 100644
--- a/drivers/platform/x86/dell/dell-wmi-sysman/string-attributes.c
+++ b/drivers/platform/x86/dell/dell-wmi-sysman/string-attributes.c
@@ -118,24 +118,38 @@ int alloc_str_data(void)

/**
* populate_str_data() - Populate all properties of an instance under string attribute
- * @str_obj: ACPI object with integer data
+ * @str_obj: ACPI object with string data
* @instance_id: The instance to enumerate
* @attr_name_kobj: The parent kernel object
*/
int populate_str_data(union acpi_object *str_obj, int instance_id, struct kobject *attr_name_kobj)
{
wmi_priv.str_data[instance_id].attr_name_kobj = attr_name_kobj;
+ if (check_property_type(str, ATTR_NAME, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.str_data[instance_id].attribute_name,
str_obj[ATTR_NAME].string.pointer);
+ if (check_property_type(str, DISPL_NAME_LANG_CODE, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.str_data[instance_id].display_name_language_code,
str_obj[DISPL_NAME_LANG_CODE].string.pointer);
+ if (check_property_type(str, DISPLAY_NAME, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.str_data[instance_id].display_name,
str_obj[DISPLAY_NAME].string.pointer);
+ if (check_property_type(str, DEFAULT_VAL, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.str_data[instance_id].default_value,
str_obj[DEFAULT_VAL].string.pointer);
+ if (check_property_type(str, MODIFIER, ACPI_TYPE_STRING))
+ return -EINVAL;
strlcpy_attr(wmi_priv.str_data[instance_id].dell_modifier,
str_obj[MODIFIER].string.pointer);
+ if (check_property_type(str, MIN_LEN, ACPI_TYPE_INTEGER))
+ return -EINVAL;
wmi_priv.str_data[instance_id].min_length = (uintptr_t)str_obj[MIN_LEN].string.pointer;
+ if (check_property_type(str, MAX_LEN, ACPI_TYPE_INTEGER))
+ return -EINVAL;
wmi_priv.str_data[instance_id].max_length = (uintptr_t) str_obj[MAX_LEN].string.pointer;

return sysfs_create_group(attr_name_kobj, &str_attr_group);
diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/sysman.c b/drivers/platform/x86/dell/dell-wmi-sysman/sysman.c
index c8d276d78e92..d21e84c7a694 100644
--- a/drivers/platform/x86/dell/dell-wmi-sysman/sysman.c
+++ b/drivers/platform/x86/dell/dell-wmi-sysman/sysman.c
@@ -481,7 +481,8 @@ static int init_bios_attributes(int attr_type, const char *guid)
/* enumerate all of this attribute */
switch (attr_type) {
case ENUM:
- retval = populate_enum_data(elements, instance_id, attr_name_kobj);
+ retval = populate_enum_data(elements, instance_id, attr_name_kobj,
+ obj->package.count);
break;
case INT:
retval = populate_int_data(elements, instance_id, attr_name_kobj);
--
2.25.1

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