OSV-2020-2139 Heap-double-free in flb_free

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27025 Crash type: Heap-double-free Crash state: flbfree flbsdsdestroy flbkvitemdestroy...

fluent-bit:flb-it-fuzz-config_map_fuzzer_OSSFUZZ: Heap-double-free in flb_free

Project: https://github.com/fluent/fluent-bit.git Detailed Report: https://oss-fuzz.com/testcase?key=6208118264168448 Project: fluent-bit Fuzzing Engine: libFuzzer Fuzz Target: flb-it-fuzz-configmapfuzzerOSSFUZZ Job Type: libfuzzerasanfluent-bit Platform Id: linux Crash Type: Heap-double-free Cra...