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avcodec/truespeech: Fix an integer overflow in truespeech_synth()

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Fixes: signed integer overflow: 2147483188 + 2048 cannot be represented in type 'int'
Fixes: 18741/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TRUESPEECH_fuzzer-5748950460268544

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 2019-11-14 16:44:10 +01:00
parent a0ae4b7df9
commit 8bcb5fbab5
1 changed files with 1 additions and 1 deletions
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libavcodec/truespeech.c
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@ -255,7 +255,7 @@ static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
int sum = 0;
for(k = 0; k < 8; k++)
sum += ptr0[k] * (unsigned)ptr1[k];
sum = out[i] + ((sum + 0x800) >> 12);
sum = out[i] + ((int)(sum + 0x800U) >> 12);
out[i] = av_clip(sum, -0x7FFE, 0x7FFE);
for(k = 7; k > 0; k--)
ptr0[k] = ptr0[k - 1];