OSV-2021-1188 Heap-buffer-overflow in MqttDecode_Publish

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=37866 Crash type: Heap-buffer-overflow WRITE 4 Crash state: MqttDecodePublish MqttClientDecodePacket MqttClientHandlePacket...