wmi: check find_guid() return value to prevent oops

Signed-off-by: rol@as2917.net <Paul Rolland>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 9f93d6c..cc9ad74 100644 (file)
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -492,8 +492,7 @@ wmi_notify_handler handler, void *data)
        if (!guid || !handler)
                return AE_BAD_PARAMETER;
 
-       find_guid(guid, &block);
-       if (!block)
+       if (!find_guid(guid, &block))
                return AE_NOT_EXIST;
 
        if (block->handler)
@@ -521,8 +520,7 @@ acpi_status wmi_remove_notify_handler(const char *guid)
        if (!guid)
                return AE_BAD_PARAMETER;
 
-       find_guid(guid, &block);
-       if (!block)
+       if (!find_guid(guid, &block))
                return AE_NOT_EXIST;
 
        if (!block->handler)