mirror of https://git.ffmpeg.org/ffmpeg.git
avcodec/dxv: Check op_offset in dxv_decompress_yo()
Fixes: signed integer overflow: -2147483648 - 8 cannot be represented in type 'int' Fixes: 17745/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DXV_fuzzer-5734628463214592 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -799,6 +799,9 @@ static int dxv_decompress_yo(DXVContext *ctx, GetByteContext *gb,
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uint8_t *dst, *table0[256] = { 0 }, *table1[256] = { 0 };
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int ret, state = 0, skip, oi = 0, v, vv;
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if (op_offset < 8 || op_offset - 8 > bytestream2_get_bytes_left(gb))
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return AVERROR_INVALIDDATA;
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dst = tex_data;
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bytestream2_skip(gb, op_offset - 8);
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if (op_size > max_op_size)
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