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avcodec/4xm: Check for cfrm exhaustion 

Fixes: index -1 out of bounds for type 'CFrameBuffer [100]'
Fixes: 63877/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FOURXM_fuzzer-5854263397711872

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-11-08 01:44:07 +01:00
parent 19fcf43131
commit bb0a684d93
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1 changed files with 2 additions and 0 deletions
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libavcodec/4xm.c
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@ -885,6 +885,8 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *picture,
}
if (i >= CFRAME_BUFFER_COUNT) {
if (free_index < 0)
return AVERROR_INVALIDDATA;
i = free_index;
f->cfrm[i].id = id;
}