ffmpeg | branch: master | Michael Niedermayer <mich...@niedermayer.cc> | Mon Mar 13 02:25:42 2017 +0100| [45198477de19ccb00729b7eec07d81494f0353e0] | committer: Michael Niedermayer
avcodec/simple_idct_template: Fix several integer overflows Benchmarks with START_TIMER indicate that the code is faster with unsigned, (that is with the patch), there was quite some fluctuation in the numbers so this may be just random Fixes: 811/clusterfuzz-testcase-6465493076541440 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=45198477de19ccb00729b7eec07d81494f0353e0 --- libavcodec/simple_idct_template.c | 36 ++++++++++++++++++------------------ 1 file changed, 18 insertions(+), 18 deletions(-) diff --git a/libavcodec/simple_idct_template.c b/libavcodec/simple_idct_template.c index f5744e0..c669767 100644 --- a/libavcodec/simple_idct_template.c +++ b/libavcodec/simple_idct_template.c @@ -112,7 +112,7 @@ static inline void FUNC(idctRowCondDC_extrashift)(int16_t *row, int extra_shift) static inline void FUNC(idctRowCondDC)(int16_t *row, int extra_shift) #endif { - int a0, a1, a2, a3, b0, b1, b2, b3; + SUINT a0, a1, a2, a3, b0, b1, b2, b3; #if HAVE_FAST_64BIT #define ROW0_MASK (0xffffLL << 48 * HAVE_BIGENDIAN) @@ -187,14 +187,14 @@ static inline void FUNC(idctRowCondDC)(int16_t *row, int extra_shift) MAC(b3, -W1, row[7]); } - row[0] = (a0 + b0) >> (ROW_SHIFT + extra_shift); - row[7] = (a0 - b0) >> (ROW_SHIFT + extra_shift); - row[1] = (a1 + b1) >> (ROW_SHIFT + extra_shift); - row[6] = (a1 - b1) >> (ROW_SHIFT + extra_shift); - row[2] = (a2 + b2) >> (ROW_SHIFT + extra_shift); - row[5] = (a2 - b2) >> (ROW_SHIFT + extra_shift); - row[3] = (a3 + b3) >> (ROW_SHIFT + extra_shift); - row[4] = (a3 - b3) >> (ROW_SHIFT + extra_shift); + row[0] = (int)(a0 + b0) >> (ROW_SHIFT + extra_shift); + row[7] = (int)(a0 - b0) >> (ROW_SHIFT + extra_shift); + row[1] = (int)(a1 + b1) >> (ROW_SHIFT + extra_shift); + row[6] = (int)(a1 - b1) >> (ROW_SHIFT + extra_shift); + row[2] = (int)(a2 + b2) >> (ROW_SHIFT + extra_shift); + row[5] = (int)(a2 - b2) >> (ROW_SHIFT + extra_shift); + row[3] = (int)(a3 + b3) >> (ROW_SHIFT + extra_shift); + row[4] = (int)(a3 - b3) >> (ROW_SHIFT + extra_shift); } #define IDCT_COLS do { \ @@ -253,25 +253,25 @@ static inline void FUNC(idctSparseCol_extrashift)(int16_t *col) static inline void FUNC(idctSparseColPut)(pixel *dest, int line_size, int16_t *col) { - int a0, a1, a2, a3, b0, b1, b2, b3; + SUINT a0, a1, a2, a3, b0, b1, b2, b3; IDCT_COLS; - dest[0] = av_clip_pixel((a0 + b0) >> COL_SHIFT); + dest[0] = av_clip_pixel((int)(a0 + b0) >> COL_SHIFT); dest += line_size; - dest[0] = av_clip_pixel((a1 + b1) >> COL_SHIFT); + dest[0] = av_clip_pixel((int)(a1 + b1) >> COL_SHIFT); dest += line_size; - dest[0] = av_clip_pixel((a2 + b2) >> COL_SHIFT); + dest[0] = av_clip_pixel((int)(a2 + b2) >> COL_SHIFT); dest += line_size; - dest[0] = av_clip_pixel((a3 + b3) >> COL_SHIFT); + dest[0] = av_clip_pixel((int)(a3 + b3) >> COL_SHIFT); dest += line_size; - dest[0] = av_clip_pixel((a3 - b3) >> COL_SHIFT); + dest[0] = av_clip_pixel((int)(a3 - b3) >> COL_SHIFT); dest += line_size; - dest[0] = av_clip_pixel((a2 - b2) >> COL_SHIFT); + dest[0] = av_clip_pixel((int)(a2 - b2) >> COL_SHIFT); dest += line_size; - dest[0] = av_clip_pixel((a1 - b1) >> COL_SHIFT); + dest[0] = av_clip_pixel((int)(a1 - b1) >> COL_SHIFT); dest += line_size; - dest[0] = av_clip_pixel((a0 - b0) >> COL_SHIFT); + dest[0] = av_clip_pixel((int)(a0 - b0) >> COL_SHIFT); } static inline void FUNC(idctSparseColAdd)(pixel *dest, int line_size, _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
