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avcodec/ffwavesynth: Correct undefined overflow of PINK_UNIT 

Fixes: signed integer overflow: 9223372036854775775 + 128 cannot be represented in type 'long'
Fixes: 20054/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFWAVESYNTH_fuzzer-5686385113825280

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 2020-01-17 23:42:08 +01:00
parent 054ce5f786
commit 187161d62f
1 changed files with 1 additions and 1 deletions
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2
libavcodec/ffwavesynth.c
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@ -217,7 +217,7 @@ static void wavesynth_seek(struct wavesynth_context *ws, int64_t ts)
*last = -1;
lcg_seek(&ws->dither_state, (uint32_t)ts - (uint32_t)ws->cur_ts);
if (ws->pink_need) {
uint64_t pink_ts_cur = (ws->cur_ts + PINK_UNIT - 1) & ~(PINK_UNIT - 1);
uint64_t pink_ts_cur = (ws->cur_ts + (uint64_t)PINK_UNIT - 1) & ~(PINK_UNIT - 1);
uint64_t pink_ts_next = ts & ~(PINK_UNIT - 1);
int pos = ts & (PINK_UNIT - 1);
lcg_seek(&ws->pink_state, (uint32_t)(pink_ts_next - pink_ts_cur) * 2);