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avcodec/ffwavesynth: Fix integer overflows in pink noise addition 

Fixes: signed integer overflow: -1795675744 + -1926578528 cannot be represented in type 'int'
Fixes: 17741/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFWAVESYNTH_fuzzer-5131336402075648

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-09-30 00:35:15 +02:00
parent 6fdeb20817
commit 7916b6863c
1 changed files with 2 additions and 2 deletions
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4
libavcodec/ffwavesynth.c
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@ -377,7 +377,7 @@ static void wavesynth_synth_sample(struct wavesynth_context *ws, int64_t ts,
in->dphi += in->ddphi;
break;
case WS_NOISE:
val = amp * pink;
val = amp * (unsigned)pink;
break;
default:
val = 0;
@ -385,7 +385,7 @@ static void wavesynth_synth_sample(struct wavesynth_context *ws, int64_t ts,
all_ch |= in->channels;
for (c = in->channels, cv = channels; c; c >>= 1, cv++)
if (c & 1)
*cv += val;
*cv += (unsigned)val;
}
val = (int32_t)lcg_next(&ws->dither_state) >> 16;
for (c = all_ch, cv = channels; c; c >>= 1, cv++)