[FFmpeg-cvslog] avcodec/ffwavesynth: Check if there is enough extradata before allocation

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Mon Jul 15 00:35:49 2019 +0200| [65bac4a7825e1f2bbf4112569ffa363cc1fdbce5] | committer: Michael Niedermayer

avcodec/ffwavesynth: Check if there is enough extradata before allocation

Fixes: OOM
Fixes: 15750/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFWAVESYNTH_fuzzer-5702090367696896

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Nicolas George <george at nsup.org>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=65bac4a7825e1f2bbf4112569ffa363cc1fdbce5
---

 libavcodec/ffwavesynth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/ffwavesynth.c b/libavcodec/ffwavesynth.c
index 94a843e3ca..b319b3341a 100644
--- a/libavcodec/ffwavesynth.c
+++ b/libavcodec/ffwavesynth.c
@@ -247,7 +247,7 @@ static int wavesynth_parse_extradata(AVCodecContext *avc)
     edata_end = edata + avc->extradata_size;
     ws->nb_inter = AV_RL32(edata);
     edata += 4;
-    if (ws->nb_inter < 0)
+    if (ws->nb_inter < 0 || (edata_end - edata) / 24 < ws->nb_inter)
         return AVERROR(EINVAL);
     ws->inter = av_calloc(ws->nb_inter, sizeof(*ws->inter));
     if (!ws->inter)