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avcodec/jpeg2000dec: Check atom_size in jp2_find_codestream()

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Fixes: Infinite loop
Fixes: 29722/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-6412228041506816

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 2021-01-31 16:54:06 +01:00
parent 3a24000e72
commit 2a2082a41b
1 changed files with 4 additions and 0 deletions
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4
libavcodec/jpeg2000dec.c
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@ -2342,8 +2342,12 @@ static int jp2_find_codestream(Jpeg2000DecoderContext *s)
return 0;
}
atom_size = bytestream2_get_be32u(&s->g);
if (atom_size < 16 || (int64_t)bytestream2_tell(&s->g) + atom_size - 16 > INT_MAX)
return AVERROR_INVALIDDATA;
atom_end = bytestream2_tell(&s->g) + atom_size - 16;
} else {
if (atom_size < 8 || (int64_t)bytestream2_tell(&s->g) + atom_size - 8 > INT_MAX)
return AVERROR_INVALIDDATA;
atom_end = bytestream2_tell(&s->g) + atom_size - 8;
}