Fix security vulnerability: Equalizer command might allow negative indexes am:...

Fix security vulnerability: Equalizer command might allow negative indexes am: e981cca9 am: 8fb82754 am: 6b4cf2c0 am: dd060b3b am: 4bcf2e6f am: 81e09144 am: 3d16a9c4 am: cde28c8a am: 00d12e30 am: 67f8e40f am: 1b1d8e79 am: f386ebab am: 427e1829 am: 635d9559 am: fb35b665
am: 6184728e

Change-Id: If01a67472b815144967f9455ba8803219a758863