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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-02-21 03:14:49 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-02-21 15:31:06 +0100 |
| commit | 28dc6e729137ba7927f46ba15c337417b8708fe8 (patch) | |
| tree | abf83cbc6660078c47461c3d2fa2ea1c7d277f6e /libavcodec/simple_idct.c | |
| parent | 956472a3236cc8eaeba5147c55b51bde6005c898 (diff) | |
| download | ffmpeg-28dc6e729137ba7927f46ba15c337417b8708fe8.tar.gz | |
avcodec/simple_idct: Fix runtime error: left shift of negative value -6395
Fixes: 633/clusterfuzz-testcase-4553133554401280
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/simple_idct.c')
| -rw-r--r-- | libavcodec/simple_idct.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/libavcodec/simple_idct.c b/libavcodec/simple_idct.c index 0711e167a5..65b2911447 100644 --- a/libavcodec/simple_idct.c +++ b/libavcodec/simple_idct.c @@ -66,8 +66,8 @@ static inline void idct4col_put(uint8_t *dest, int line_size, const int16_t *col a1 = col[8*2]; a2 = col[8*4]; a3 = col[8*6]; - c0 = ((a0 + a2) << (CN_SHIFT - 1)) + (1 << (C_SHIFT - 1)); - c2 = ((a0 - a2) << (CN_SHIFT - 1)) + (1 << (C_SHIFT - 1)); + c0 = ((a0 + a2) * (1 << CN_SHIFT - 1)) + (1 << (C_SHIFT - 1)); + c2 = ((a0 - a2) * (1 << CN_SHIFT - 1)) + (1 << (C_SHIFT - 1)); c1 = a1 * C1 + a3 * C2; c3 = a1 * C2 - a3 * C1; dest[0] = av_clip_uint8((c0 + c1) >> C_SHIFT); |