libchewing: Heap-buffer-overflow in _Inner_InternalSpecialSymbol

Detailed report: https://clusterfuzz-external.appspot.com/testcase?key=4564616034123776 Fuzzer: libFuzzerchewingdynamicconfigfuzzer Job Type: libfuzzerasanlibchewing Platform Id: linux Crash Type: Heap-buffer-overflow READ Crash Address: 0x7f302a8f1fb0 Crash State: InnerInternalSpecialSymbol...