wmi: check find_guid() return value to prevent oops
Signed-off-by: Paul Rolland <rol@as2917.net> Signed-off-by: Len Brown <len.brown@intel.com>
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@ -492,8 +492,7 @@ wmi_notify_handler handler, void *data)
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if (!guid || !handler)
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return AE_BAD_PARAMETER;
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find_guid(guid, &block);
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if (!block)
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if (!find_guid(guid, &block))
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return AE_NOT_EXIST;
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if (block->handler)
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@ -521,8 +520,7 @@ acpi_status wmi_remove_notify_handler(const char *guid)
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if (!guid)
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return AE_BAD_PARAMETER;
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find_guid(guid, &block);
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if (!block)
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if (!find_guid(guid, &block))
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return AE_NOT_EXIST;
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if (!block->handler)
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