Detailed Report: https://oss-fuzz.com/testcase?key=5197905562173440 Project: grok Fuzzing Engine: libFuzzer Fuzz Target: grk_decompress_fuzzer Job Type: libfuzzer_msan_grok Platform Id: linux Crash Type: UNKNOWN READ Crash Address: 0x000000003c00 Crash State: grk::SparseBuffer<6u, 6u>::read_or_write grk::SparseBuffer<6u, 6u>::read bool grk::decode_partial_tile<grk::vec4f, 4u, 4u, 4u, grk::Partial97> Sanitizer: memory (MSAN) Recommended Security Severity: Medium Regressed: https://oss-fuzz.com/revisions?job=libfuzzer_msan_grok&range=202010110617:202010120624 Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=5197905562173440 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.