OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=12919
Crash type: Global-buffer-overflow READ 4
Crash state:
kencodingprober::nsCodingStateMachine::NextState
kencodingprober::nsEscCharSetProber::HandleData
kencodingprober::nsUniversalDetector::HandleData