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avcodec/cdtoons: Fix off by 4 check on diff_size

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Fixes: out of array read
Fixes: 20742/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CDTOONS_fuzzer-5738148607033344

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>
This commit is contained in:
Michael Niedermayer 2020-02-20 18:51:36 +01:00
parent 4c31db5a32
commit d2aff350bc
1 changed files with 1 additions and 1 deletions
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2
libavcodec/cdtoons.c
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@ -269,7 +269,7 @@ static int cdtoons_decode_frame(AVCodecContext *avctx, void *data,
diff_size = bytestream_get_be32(&buf);
width = bytestream_get_be16(&buf);
height = bytestream_get_be16(&buf);
if (diff_size < 4 || diff_size - 4 > eod - buf) {
if (diff_size < 8 || diff_size - 4 > eod - buf) {
av_log(avctx, AV_LOG_WARNING, "Ran (seriously) out of data for Diff frame data.\n");
return AVERROR_INVALIDDATA;
}