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avcodec/fic: Fixes signed integer overflow 

Fixes: runtime error: signed integer overflow: 1037142357 + 1227025305 cannot be represented in type 'int'
Fixes: 3024/clusterfuzz-testcase-minimized-5885660323905536

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 0c9d5b015c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-08-17 18:24:37 +02:00
parent d0842707a5
commit 58b7dfde12
1 changed files with 6 additions and 6 deletions
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12
libavcodec/fic.c
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@ -81,12 +81,12 @@ static const uint8_t fic_header[7] = { 0, 0, 1, 'F', 'I', 'C', 'V' };
static av_always_inline void fic_idct(int16_t *blk, int step, int shift, int rnd)
{
const int t0 = 27246 * blk[3 * step] + 18405 * blk[5 * step];
const int t1 = 27246 * blk[5 * step] - 18405 * blk[3 * step];
const int t2 = 6393 * blk[7 * step] + 32139 * blk[1 * step];
const int t3 = 6393 * blk[1 * step] - 32139 * blk[7 * step];
const unsigned t4 = 5793U * (t2 + t0 + 0x800 >> 12);
const unsigned t5 = 5793U * (t3 + t1 + 0x800 >> 12);
const unsigned t0 = 27246 * blk[3 * step] + 18405 * blk[5 * step];
const unsigned t1 = 27246 * blk[5 * step] - 18405 * blk[3 * step];
const unsigned t2 = 6393 * blk[7 * step] + 32139 * blk[1 * step];
const unsigned t3 = 6393 * blk[1 * step] - 32139 * blk[7 * step];
const unsigned t4 = 5793U * ((int)(t2 + t0 + 0x800) >> 12);
const unsigned t5 = 5793U * ((int)(t3 + t1 + 0x800) >> 12);
const unsigned t6 = t2 - t0;
const unsigned t7 = t3 - t1;
const unsigned t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step];