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avcodec/vc1_block: Fixes integer overflow in vc1_decode_i_block_adv()

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Fixes: signed integer overflow: 62220 * 262144 cannot be represented in type 'int'
Fixes: 17145/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1IMAGE_fuzzer-5667394743173120

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 6fdeb20817)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-09-28 21:19:26 +02:00
parent b91ae0cd39
commit bd0819ad5b
1 changed files with 1 additions and 1 deletions
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libavcodec/vc1_block.c
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@ -825,7 +825,7 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
return AVERROR_INVALIDDATA;
q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
for (k = 1; k < 8; k++)
block[k << sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
block[k << sh] += (int)(ac_val[k] * (unsigned)q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
} else {
for (k = 1; k < 8; k++)
block[k << sh] += ac_val[k];