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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-06-17 21:26:45 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-06-29 19:22:19 +0200 |
| commit | cf3c245566e8a8d45ed2ad9fdff9ef50327ba2d3 (patch) | |
| tree | 68e077d8e9ccd45053b51c28fea664a73199a9be | |
| parent | 7c30ff38880570377168096417f714b21102b343 (diff) | |
| download | ffmpeg-cf3c245566e8a8d45ed2ad9fdff9ef50327ba2d3.tar.gz | |
avcodec/libvorbisdec: Check extradata size
Fixes: out of array read
Fixes: 15261/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LIBVORBIS_fuzzer-5764908467093504
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/libvorbisdec.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/libavcodec/libvorbisdec.c b/libavcodec/libvorbisdec.c index ecf690a553..89cbbb41b6 100644 --- a/libavcodec/libvorbisdec.c +++ b/libavcodec/libvorbisdec.c @@ -49,8 +49,16 @@ static int oggvorbis_decode_init(AVCodecContext *avccontext) { vorbis_comment_init(&context->vc) ; if(p[0] == 0 && p[1] == 30) { + int sizesum = 0; for(i = 0; i < 3; i++){ hsizes[i] = bytestream_get_be16((const uint8_t **)&p); + sizesum += 2 + hsizes[i]; + if (sizesum > avccontext->extradata_size) { + av_log(avccontext, AV_LOG_ERROR, "vorbis extradata too small\n"); + ret = AVERROR_INVALIDDATA; + goto error; + } + headers[i] = p; p += hsizes[i]; } |