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avcodec/h264idct_template: Fix integer overflows in ff_h264_idct8_add() 

Fixes: runtime error: signed integer overflow: -503316480 + -2013265038 cannot be represented in type 'int'
Fixes: 3805/clusterfuzz-testcase-minimized-6578427831255040

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-11-04 01:19:20 +01:00
parent e06bdc3c37
commit e131b8cedb
1 changed files with 4 additions and 4 deletions
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8
libavcodec/h264idct_template.c
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@ -91,10 +91,10 @@ void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, int16_t *_block, int stride){
const int a5 = -block[i+1*8] + (unsigned)block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1);
const int a7 = block[i+3*8] + (unsigned)block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1);
const int b1 = (a7>>2) + a1;
const int b3 = a3 + (a5>>2);
const int b5 = (a3>>2) - a5;
const int b7 = a7 - (a1>>2);
const int b1 = (a7>>2) + (unsigned)a1;
const int b3 = (unsigned)a3 + (a5>>2);
const int b5 = (a3>>2) - (unsigned)a5;
const int b7 = (unsigned)a7 - (a1>>2);
block[i+0*8] = b0 + b7;
block[i+7*8] = b0 - b7;