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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-06-26 00:03:01 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-07-08 09:38:04 +0200 |
| commit | b5f2cfd2ad2b269d3de79083dbb9162a632b69bb (patch) | |
| tree | d7896d41e1bbc19a8be64c1735dc5def104fa6f7 /libavcodec | |
| parent | 7b114d76878f1a542bcb75456492cc43e6414f8b (diff) | |
| download | ffmpeg-b5f2cfd2ad2b269d3de79083dbb9162a632b69bb.tar.gz | |
avcodec/simple_idct_template: Fix integer overflow in idctSparseCol()
Fixes: signed integer overflow: -1027919784 + -1120041624 cannot be represented in type 'int'
Fixes: 15406/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV3_fuzzer-5700646528876544
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')
| -rw-r--r-- | libavcodec/simple_idct_template.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/libavcodec/simple_idct_template.c b/libavcodec/simple_idct_template.c index 35c31321c6..90d1c21355 100644 --- a/libavcodec/simple_idct_template.c +++ b/libavcodec/simple_idct_template.c @@ -312,18 +312,18 @@ static inline void FUNC6(idctSparseColAdd)(pixel *dest, ptrdiff_t line_size, static inline void FUNC6(idctSparseCol)(idctin *col) #endif { - int a0, a1, a2, a3, b0, b1, b2, b3; + unsigned a0, a1, a2, a3, b0, b1, b2, b3; IDCT_COLS; - col[0 ] = ((a0 + b0) >> COL_SHIFT); - col[8 ] = ((a1 + b1) >> COL_SHIFT); - col[16] = ((a2 + b2) >> COL_SHIFT); - col[24] = ((a3 + b3) >> COL_SHIFT); - col[32] = ((a3 - b3) >> COL_SHIFT); - col[40] = ((a2 - b2) >> COL_SHIFT); - col[48] = ((a1 - b1) >> COL_SHIFT); - col[56] = ((a0 - b0) >> COL_SHIFT); + col[0 ] = ((int)(a0 + b0) >> COL_SHIFT); + col[8 ] = ((int)(a1 + b1) >> COL_SHIFT); + col[16] = ((int)(a2 + b2) >> COL_SHIFT); + col[24] = ((int)(a3 + b3) >> COL_SHIFT); + col[32] = ((int)(a3 - b3) >> COL_SHIFT); + col[40] = ((int)(a2 - b2) >> COL_SHIFT); + col[48] = ((int)(a1 - b1) >> COL_SHIFT); + col[56] = ((int)(a0 - b0) >> COL_SHIFT); } #ifndef EXTRA_SHIFT |