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

Type ossfuzz
Reporter Google
Modified 2020-04-02T18:53:24


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.

See https://google.github.io/oss-fuzz/advanced-topics/reproducing for instructions to reproduce this bug locally. When you fix this bug, please * mention the fix revision(s). * state whether the bug was a short-lived regression or an old bug in any stable releases. * add any other useful information. This information can help downstream consumers.

If you need to contact the OSS-Fuzz team with a question, concern, or any other feedback, please file an issue at https://github.com/google/oss-fuzz/issues. Comments on individual Monorail issues are not monitored.

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.