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Subject[PATCH] platform/x86: dell-wmi-sysman: fix a NULL pointer dereference
Date
An upcoming Dell platform is causing a NULL pointer dereference
in dell-wmi-sysman initialization. Validate that the input from
BIOS matches correct ACPI types and abort module initialization
if it fails.

This leads to a memory leak that needs to be cleaned up properly.

Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
---
drivers/platform/x86/dell-wmi-sysman/sysman.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/dell-wmi-sysman/sysman.c b/drivers/platform/x86/dell-wmi-sysman/sysman.c
index dc6dd531c996..38b497991071 100644
--- a/drivers/platform/x86/dell-wmi-sysman/sysman.c
+++ b/drivers/platform/x86/dell-wmi-sysman/sysman.c
@@ -419,13 +419,19 @@ static int init_bios_attributes(int attr_type, const char *guid)
return retval;
/* need to use specific instance_id and guid combination to get right data */
obj = get_wmiobj_pointer(instance_id, guid);
- if (!obj)
+ if (!obj || obj->type != ACPI_TYPE_PACKAGE) {
+ release_attributes_data();
return -ENODEV;
+ }
elements = obj->package.elements;

mutex_lock(&wmi_priv.mutex);
while (elements) {
/* sanity checking */
+ if (elements[ATTR_NAME].type != ACPI_TYPE_STRING) {
+ pr_debug("incorrect element type\n");
+ goto nextobj;
+ }
if (strlen(elements[ATTR_NAME].string.pointer) == 0) {
pr_debug("empty attribute found\n");
goto nextobj;
--
2.25.1
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