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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-18 17:13:18 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-18 18:08:23 +0200 |
| commit | a173f484b52ed63292439de5347e49bd78cad0ed (patch) | |
| tree | b8f3cba16a2ce8b437b21d4457e923e445025c2b /libavcodec/fic.c | |
| parent | d32ebce8fd79bb859ba4a04c92470a052f2aafa6 (diff) | |
| download | ffmpeg-a173f484b52ed63292439de5347e49bd78cad0ed.tar.gz | |
avcodec/fic: Fix multiple runtime error: signed integer overflow: 5793 * 419752 cannot be represented in type 'int'
Fixes: 1669/clusterfuzz-testcase-minimized-5287529198649344
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/fic.c')
| -rw-r--r-- | libavcodec/fic.c | 32 |
1 files changed, 16 insertions, 16 deletions
diff --git a/libavcodec/fic.c b/libavcodec/fic.c index 613b306af5..46260ee281 100644 --- a/libavcodec/fic.c +++ b/libavcodec/fic.c @@ -89,22 +89,22 @@ static av_always_inline void fic_idct(int16_t *blk, int step, int shift, int rnd 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 int t4 = 5793 * (t2 + t0 + 0x800 >> 12); - const int t5 = 5793 * (t3 + t1 + 0x800 >> 12); - const int t6 = t2 - t0; - const int t7 = t3 - t1; - const int t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step]; - const int t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step]; - const int tA = (blk[0 * step] - blk[4 * step]) * 32768 + rnd; - const int tB = (blk[0 * step] + blk[4 * step]) * 32768 + rnd; - blk[0 * step] = ( t4 + t9 + tB) >> shift; - blk[1 * step] = ( t6 + t7 + t8 + tA) >> shift; - blk[2 * step] = ( t6 - t7 - t8 + tA) >> shift; - blk[3 * step] = ( t5 - t9 + tB) >> shift; - blk[4 * step] = ( -t5 - t9 + tB) >> shift; - blk[5 * step] = (-(t6 - t7) - t8 + tA) >> shift; - blk[6 * step] = (-(t6 + t7) + t8 + tA) >> shift; - blk[7 * step] = ( -t4 + t9 + tB) >> shift; + const unsigned t4 = 5793U * (t2 + t0 + 0x800 >> 12); + const unsigned t5 = 5793U * (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]; + const unsigned t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step]; + const unsigned tA = (blk[0 * step] - blk[4 * step]) * 32768 + rnd; + const unsigned tB = (blk[0 * step] + blk[4 * step]) * 32768 + rnd; + blk[0 * step] = (int)( t4 + t9 + tB) >> shift; + blk[1 * step] = (int)( t6 + t7 + t8 + tA) >> shift; + blk[2 * step] = (int)( t6 - t7 - t8 + tA) >> shift; + blk[3 * step] = (int)( t5 - t9 + tB) >> shift; + blk[4 * step] = (int)( -t5 - t9 + tB) >> shift; + blk[5 * step] = (int)(-(t6 - t7) - t8 + tA) >> shift; + blk[6 * step] = (int)(-(t6 + t7) + t8 + tA) >> shift; + blk[7 * step] = (int)( -t4 + t9 + tB) >> shift; } static void fic_idct_put(uint8_t *dst, int stride, int16_t *block) |