graphicsmagick:coder_MP4_fuzzer: Use-of-uninitialized-value in decoder_context::construct_reference_picture_lists

Project: http://hg.code.sf.net/p/graphicsmagick/code Detailed Report: https://oss-fuzz.com/testcase?key=5217760023216128 Project: graphicsmagick Fuzzing Engine: libFuzzer Fuzz Target: coderMP4fuzzer Job Type: libfuzzermsangraphicsmagick Platform Id: linux Crash Type: Use-of-uninitialized-value...