libreoffice/hwpfuzzer: Crash in HMemIODev::readBlock

Project:
git://anongit.freedesktop.org/libreoffice/core

Detailed report: https://oss-fuzz.com/testcase?key=6325603499245568

Project: libreoffice
Fuzzer: libFuzzer_libreoffice_hwpfuzzer
Fuzz target binary: hwpfuzzer
Job Type: libfuzzer_ubsan_libreoffice
Platform Id: linux

Crash Type: UNKNOWN WRITE
Crash Address: 0x7fffe6777000
Crash State:
HMemIODev::readBlock
Picture::Read
HWPPara::readHBox

Sanitizer: undefined (UBSAN)

Recommended Security Severity: High

Regressed: https://oss-fuzz.com/revisions?job=libfuzzer_ubsan_libreoffice&range=201801250611:201801260620

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=6325603499245568

Issue filed automatically.

See https://github.com/google/oss-fuzz/blob/master/docs/reproducing.md for more information.

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