Heap-buffer-overflow in _Inner_InternalSpecialSymbol

Project:
https://github.com/chewing/libchewing.git

Detailed report: https://clusterfuzz-external.appspot.com/testcase?key=6203601458298880

Fuzzer: libFuzzer_chewing_fuzzer
Job Type: libfuzzer_asan_libchewing
Platform Id: linux

Crash Type: Heap-buffer-overflow READ {*}
Crash Address: 0x7f1300d44fb0
Crash State:
_Inner_InternalSpecialSymbol
EasySymbolInput
chewing_handle_Default

Recommended Security Severity: Medium

Regressed: https://clusterfuzz-external.appspot.com/revisions?job=libfuzzer_asan_libchewing&range=201610180925:201610182030

Minimized Testcase (1.52 Kb): https://clusterfuzz-external.appspot.com/download/AMIfv94205qcIn9sfQ6jSPkiJ4wuxHOymM_omqi7XkUaXH3xypmJFg0Ch0pEIYed4WLD2_cqj-NChvjaUTe-7NwwxGUs8gzPk8TZtlGOICB7sMXHNM5JMKDlziMfVmzLT2UuIh6nQHTVgJYySjLLK4kh2m6E4nCl9LR4ZqWy_226LymDxOFEaZ0?testcase_id=6203601458298880

Issue filed automatically.

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