[FFmpeg-cvslog] avcodec/ffwavesynth: Check sample rate before use

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Mon Jul 15 00:35:47 2019 +0200| [c95857a4237d7a0c55378a44f51d2d809f3bc8f5] | committer: Michael Niedermayer

avcodec/ffwavesynth: Check sample rate before use

Fixes: division by zero
Fixes: 15725/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFWAVESYNTH_fuzzer-5641231956180992

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=c95857a4237d7a0c55378a44f51d2d809f3bc8f5
---

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

diff --git a/libavcodec/ffwavesynth.c b/libavcodec/ffwavesynth.c
index 793eada7a5..1dbfaa5847 100644
--- a/libavcodec/ffwavesynth.c
+++ b/libavcodec/ffwavesynth.c
@@ -270,7 +270,7 @@ static int wavesynth_parse_extradata(AVCodecContext *avc)
         dt = in->ts_end - in->ts_start;
         switch (in->type) {
             case WS_SINE:
-                if (edata_end - edata < 20)
+                if (edata_end - edata < 20 || avc->sample_rate <= 0)
                     return AVERROR(EINVAL);
                 f1  = AV_RL32(edata +  0);
                 f2  = AV_RL32(edata +  4);