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avcodec/ffwavesynth: Check sample rate before use

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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@nsup.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit c95857a423)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-07-15 00:35:47 +02:00
parent ddda370a97
commit 205fa4092a
1 changed files with 1 additions and 1 deletions
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2
libavcodec/ffwavesynth.c
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@ -270,7 +270,7 @@ static int wavesynth_parse_extradata(AVCodecContext *avc)
dt = in->ts_end - in->ts_start; dt = in->ts_end - in->ts_start;
switch (in->type) { switch (in->type) {
case WS_SINE: case WS_SINE:
if (edata_end - edata < 20) if (edata_end - edata < 20 || avc->sample_rate <= 0)
return AVERROR(EINVAL); return AVERROR(EINVAL);
f1 = AV_RL32(edata + 0); f1 = AV_RL32(edata + 0);
f2 = AV_RL32(edata + 4); f2 = AV_RL32(edata + 4);