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avcodec/qdm2: The smallest header seems to have 2 bytes so treat 1 as invalid

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Fixes: Timeout (217sec -> 2ms)
Fixes: 18488/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_QDM2_fuzzer-5708293662310400

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 2019-10-31 15:22:53 +01:00
parent dc3f327e74
commit e36ccb5048
1 changed files with 1 additions and 1 deletions
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2
libavcodec/qdm2.c
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@ -1704,7 +1704,7 @@ static av_cold int qdm2_decode_init(AVCodecContext *avctx)
s->group_size = bytestream2_get_be32(&gb);
s->fft_size = bytestream2_get_be32(&gb);
s->checksum_size = bytestream2_get_be32(&gb);
if (s->checksum_size >= 1U << 28 || !s->checksum_size) {
if (s->checksum_size >= 1U << 28 || s->checksum_size <= 1) {
av_log(avctx, AV_LOG_ERROR, "data block size invalid (%u)\n", s->checksum_size);
return AVERROR_INVALIDDATA;
}