jsc: Heap-use-after-free in JSC::PolymorphicAccess::regenerate

2020-02-27T22:17:49
ID OSSFUZZ-20930
Type ossfuzz
Reporter Google
Modified 2020-04-02T18:53:24

Description

Detailed Report: https://oss-fuzz.com/testcase?key=5147592910700544

Project: jsc Fuzzer: js_fuzzer Job Type: asan_jsc Platform Id: linux

Crash Type: Heap-use-after-free READ 4 Crash Address: 0x60a000055950 Crash State: JSC::PolymorphicAccess::regenerate JSC::StructureStubInfo::addAccessCase JSC::StructureStubInfo::addAccessCase

Sanitizer: address (ASAN)

Regressed: https://oss-fuzz.com/revisions?job=asan_jsc&range=202002250324:202002260325

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=5147592910700544

Issue filed automatically.

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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.