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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-08-17 18:24:37 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-08-20 02:59:57 +0200 |
| commit | 0c9d5b015c2022e8deebb93367f8ee8a8eb779e8 (patch) | |
| tree | 2f1d1c07899f9c46a9b1747c49d018bf5491b5fc /libavcodec/fic.c | |
| parent | d132683ddd4050d3fe103ca88c73258c3442dc34 (diff) | |
| download | ffmpeg-0c9d5b015c2022e8deebb93367f8ee8a8eb779e8.tar.gz | |
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>
Diffstat (limited to 'libavcodec/fic.c')
| -rw-r--r-- | libavcodec/fic.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/libavcodec/fic.c b/libavcodec/fic.c index 46260ee281..d7ee370423 100644 --- a/libavcodec/fic.c +++ b/libavcodec/fic.c @@ -85,12 +85,12 @@ 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]; |