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avcodec/4xm: Check pre_gb in decode_i_block()
Fixes: Timeout Fixes: 31257/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FOURXM_fuzzer-5150866229297152 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -499,8 +499,8 @@ static int decode_i_block(FourXContext *f, int16_t *block)
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{
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int code, i, j, level, val;
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if (get_bits_left(&f->gb) < 2){
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av_log(f->avctx, AV_LOG_ERROR, "%d bits left before decode_i_block()\n", get_bits_left(&f->gb));
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if (get_bits_left(&f->pre_gb) < 2) {
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av_log(f->avctx, AV_LOG_ERROR, "%d bits left before decode_i_block()\n", get_bits_left(&f->pre_gb));
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return AVERROR_INVALIDDATA;
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}
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