[FFmpeg-cvslog] avcodec/libvorbisdec: Check extradata size

[Michael Niedermayer]

ffmpeg | branch: release/4.1 | Michael Niedermayer <michael at niedermayer.cc> | Mon Jun 17 21:26:45 2019 +0200| [1aa0c2a06f005cac6e2f310f368a38af91682c62] | committer: Michael Niedermayer

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 at niedermayer.cc>
(cherry picked from commit cf3c245566e8a8d45ed2ad9fdff9ef50327ba2d3)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1aa0c2a06f005cac6e2f310f368a38af91682c62
---

 libavcodec/libvorbisdec.c | 8 ++++++++
 1 file changed, 8 insertions(+)

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];
         }