The following revision refers to this bug:
  https://chromium.googlesource.com/external/webrtc.git/+/3fc8e8dde365392da56724a33c2b8a05f5da75d2

commit 3fc8e8dde365392da56724a33c2b8a05f5da75d2
Author: kwiberg <kwiberg@webrtc.org>
Date: Fri May 20 11:40:29 2016

Fix UBSan errors (left shift of negative value)

BUG= chromium:604803 

Review-Url: https://codereview.webrtc.org/1988113003
Cr-Commit-Position: refs/heads/master@{#12826}

[modify] https://crrev.com/3fc8e8dde365392da56724a33c2b8a05f5da75d2/webrtc/modules/audio_coding/codecs/ilbc/do_plc.c

The CL in comment #3 fixes the bug according to my manual testing.

ClusterFuzz has detected this issue as fixed in range 396407:396452.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6325037115637760

Fuzzer: libfuzzer_audio_decoder_ilbc_fuzzer
Job Type: libfuzzer_chrome_ubsan
Platform Id: linux

Crash Type: Undefined-shift
Crash Address: 
Crash State:
  WebRtcIlbcfix_DoThePlc
  WebRtcIlbcfix_DecodeImpl
  WebRtcIlbcfix_Decode
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_ubsan&range=386932:386961
Fixed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_ubsan&range=396407:396452

Minimized Testcase (0.35 Kb): https://cluster-fuzz.appspot.com/download/AMIfv962ITns8Xa0CzeMCcVL1hd2h7O8V2BSxTBuj0eZVYlZCrp30i6GUc_NFLRUJWJaUV-fjRiquwS-JbCPRWS36GzTAzwtu7FE7sMJPDCiRSpd_gjUziXDKgOCs623EocwIaftNVnCzZmAowEz3WJ8-LXk09OdYg

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reproducing.md for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

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