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avcodec/ffwavesynth: Avoid signed integer overflow in phi_at()

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Fixes: signed integer overflow: 2314885530818453536 - -9070214327174160352 cannot be represented in type 'long'
Fixes: 31000/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFWAVESYNTH_fuzzer-6558389742206976

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 be08b84f8bb7acc0c45800c7f488399327a22961)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-03-05 20:27:50 +01:00
parent b26c6df919
commit e42efdce95
1 changed files with 1 additions and 1 deletions
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libavcodec/ffwavesynth.c
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@ -188,7 +188,7 @@ static uint64_t frac64(uint64_t a, uint64_t b)
static uint64_t phi_at(struct ws_interval *in, int64_t ts)
{
uint64_t dt = ts - in->ts_start;
uint64_t dt = ts - (uint64_t)in->ts_start;
uint64_t dt2 = dt & 1 ? /* dt * (dt - 1) / 2 without overflow */
dt * ((dt - 1) >> 1) : (dt >> 1) * (dt - 1);
return in->phi0 + dt * in->dphi0 + dt2 * in->ddphi;