libchewing: Heap-buffer-overflow in CheckUserChoose

Project: https://github.com/chewing/libchewing.git Detailed report: https://clusterfuzz-external.appspot.com/testcase?key=5228195863330816 Fuzzer: libFuzzerchewingdefaultfuzzer Job Type: libfuzzerasanlibchewing Platform Id: linux Crash Type: Heap-buffer-overflow READ 3 Crash Address: 0x6030000048...