avcodec/eatgv: Check remaining size after the keyframe header
The minimal size which unpack() will not fail on is 5 bytes Fixes: Timeout (14sec -> 77ms) (testcase 15508) Fixes: 15508/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EATGV_fuzzer-5700053513011200 Fixes: 15996/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EATGV_fuzzer-5751353223151616 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by:Michael Niedermayer <michael@niedermayer.cc>
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