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avcodec/qdm2: Check checksum_size for 0

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Fixes: Infinite loop
Fixes: 15337/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_QDM2_fuzzer-5757428949319680

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 7b2ebf89a4)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2019-06-24 01:01:04 +02:00
parent 8a95eef287
commit 3150e804d5
1 changed files with 2 additions and 2 deletions
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4
libavcodec/qdm2.c
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@@ -1728,8 +1728,8 @@ static av_cold int qdm2_decode_init(AVCodecContext *avctx)
extradata += 4;
s->checksum_size = AV_RB32(extradata);
if (s->checksum_size >= 1U << 28) {
av_log(avctx, AV_LOG_ERROR, "data block size too large (%u)\n", s->checksum_size);
if (s->checksum_size >= 1U << 28 || !s->checksum_size) {
av_log(avctx, AV_LOG_ERROR, "data block size invalid (%u)\n", s->checksum_size);
return AVERROR_INVALIDDATA;
}