libreoffice/htmlfuzzer: Crash in __dynamic_cast

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

Detailed report: https://oss-fuzz.com/testcase?key=5981969591566336

Project: libreoffice
Fuzzer: libFuzzer_libreoffice_htmlfuzzer
Fuzz target binary: htmlfuzzer
Job Type: libfuzzer_asan_libreoffice
Platform Id: linux

Crash Type: UNKNOWN READ
Crash Address: 0x000024800046
Crash State:
__dynamic_cast
FindFrameFormat
SwHTMLParser::BuildTable

Sanitizer: address (ASAN)

Recommended Security Severity: Medium

Regressed: https://oss-fuzz.com/revisions?job=libfuzzer_asan_libreoffice&range=201801010525:201801020525

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=5981969591566336

Issue filed automatically.

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

This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without an upstream patch, then the bug report will automatically
become visible to the public.

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