[FFmpeg-cvslog] avcodec/qdm2: The smallest header seems to have 2 bytes so treat 1 as invalid
Michael Niedermayer
git at videolan.org
Wed Nov 20 16:52:51 EET 2019
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Oct 31 15:22:53 2019 +0100| [e36ccb5048f052b8b2ef08281cb607fa53a7b7e4] | committer: Michael Niedermayer
avcodec/qdm2: The smallest header seems to have 2 bytes so treat 1 as invalid
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 at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e36ccb5048f052b8b2ef08281cb607fa53a7b7e4
---
libavcodec/qdm2.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/qdm2.c b/libavcodec/qdm2.c
index ac8ae8cbbb..7b9d50b234 100644
--- a/libavcodec/qdm2.c
+++ b/libavcodec/qdm2.c
@@ -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;
}
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