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avcodec/svq3: Fix multiple runtime error: signed integer overflow: -237341 * 24552 cannot be represented in type 'int'

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Fixes: 1429/clusterfuzz-testcase-minimized-5959951610544128

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit ae6fd1790f48c457a8cedb445dcac73f8f7b7698)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-10 01:26:39 +02:00
parent 4800f38ffb
commit 70cc62271b
1 changed files with 8 additions and 8 deletions
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16
libavcodec/svq3.c
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@ -224,16 +224,16 @@ void ff_svq3_add_idct_c(uint8_t *dst, int16_t *block,
}
for (i = 0; i < 4; i++) {
const int z0 = 13 * (block[i + 4 * 0] + block[i + 4 * 2]);
const int z1 = 13 * (block[i + 4 * 0] - block[i + 4 * 2]);
const int z2 = 7 * block[i + 4 * 1] - 17 * block[i + 4 * 3];
const int z3 = 17 * block[i + 4 * 1] + 7 * block[i + 4 * 3];
const unsigned z0 = 13 * (block[i + 4 * 0] + block[i + 4 * 2]);
const unsigned z1 = 13 * (block[i + 4 * 0] - block[i + 4 * 2]);
const unsigned z2 = 7 * block[i + 4 * 1] - 17 * block[i + 4 * 3];
const unsigned z3 = 17 * block[i + 4 * 1] + 7 * block[i + 4 * 3];
const int rr = (dc + 0x80000);
dst[i + stride * 0] = av_clip_uint8(dst[i + stride * 0] + ((z0 + z3) * qmul + rr >> 20));
dst[i + stride * 1] = av_clip_uint8(dst[i + stride * 1] + ((z1 + z2) * qmul + rr >> 20));
dst[i + stride * 2] = av_clip_uint8(dst[i + stride * 2] + ((z1 - z2) * qmul + rr >> 20));
dst[i + stride * 3] = av_clip_uint8(dst[i + stride * 3] + ((z0 - z3) * qmul + rr >> 20));
dst[i + stride * 0] = av_clip_uint8(dst[i + stride * 0] + ((int)((z0 + z3) * qmul + rr) >> 20));
dst[i + stride * 1] = av_clip_uint8(dst[i + stride * 1] + ((int)((z1 + z2) * qmul + rr) >> 20));
dst[i + stride * 2] = av_clip_uint8(dst[i + stride * 2] + ((int)((z1 - z2) * qmul + rr) >> 20));
dst[i + stride * 3] = av_clip_uint8(dst[i + stride * 3] + ((int)((z0 - z3) * qmul + rr) >> 20));
}
memset(block, 0, 16 * sizeof(int16_t));