openh264:decoder_fuzzer: Use-of-uninitialized-value in WelsDec::GetColocatedMb

2020-10-12T07:17:26
ID OSSFUZZ-26272
Type ossfuzz
Reporter Google
Modified 2020-11-11T19:57:31

Description

Project: https://github.com/cisco/openh264.git

Detailed Report: https://oss-fuzz.com/testcase?key=5736147944472576

Project: openh264 Fuzzing Engine: libFuzzer Fuzz Target: decoder_fuzzer Job Type: libfuzzer_msan_openh264 Platform Id: linux

Crash Type: Use-of-uninitialized-value Crash Address: Crash State: WelsDec::GetColocatedMb WelsDec::PredBDirectTemporal WelsDec::WelsDecodeMbCavlcBSlice

Sanitizer: memory (MSAN)

Recommended Security Severity: Medium

Regressed: https://oss-fuzz.com/revisions?job=libfuzzer_msan_openh264&range=202009060616:202009070630

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=5736147944472576

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.