OSV-2018-145 Heap-buffer-overflow in cras_rclient_message_from_client

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=9242 Crash type: Heap-buffer-overflow READ 4 Crash state: crasrclientmessagefromclient crasrclientbufferfromclient rclientmessage.cc...