In unflatten of GraphicBuffer.cpp, there is a possible bad fd close due to improper input validation. This could lead to local escalation o…

In unflatten of GraphicBuffer.cpp, there is a possible bad fd close due to improper input validation. This could lead to local escalation of privilege in the system server with no additional execution privileges needed. User interaction is not needed for exploitation. Product: Android. Versions: Android-8.1 Android-9. Android ID: A-114223584.