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avcodec/adpcm: Fix integer overflow in ADPCM THP

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The reference (thp.txt) uses floats so wrap around would seem incorrect.

Fixes: signed integer overflow: 1073741824 + 1073741824 cannot be represented in type 'int'
Fixes: 20658/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_THP_fuzzer-5646302555930624

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit b12b05374f7025167e2c43449ceb8ba3f0a6083f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-02-12 21:30:08 +01:00
parent f8da048589
commit 40e54383a2
1 changed files with 2 additions and 2 deletions
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libavcodec/adpcm.c
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@ -1479,8 +1479,8 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
int byte = bytestream2_get_byteu(&gb);
int index = (byte >> 4) & 7;
unsigned int exp = byte & 0x0F;
int factor1 = table[ch][index * 2];
int factor2 = table[ch][index * 2 + 1];
int64_t factor1 = table[ch][index * 2];
int64_t factor2 = table[ch][index * 2 + 1];
/* Decode 14 samples. */
for (n = 0; n < 14 && (i * 14 + n < nb_samples); n++) {