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avcodec/h264idct_template: Fix integer overflow in ff_h264_chroma422_dc_dequant_idct()

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Fixes: signed integer overflow: -2105540608 - 2105540608 cannot be represented in type 'int'
Fixes: 26870/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_H264_fuzzer-5656647567147008

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 51dfd6f1bd)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-11-05 22:14:21 +01:00
parent 86d0295f38
commit 852f1ebe9c
1 changed files with 2 additions and 2 deletions
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libavcodec/h264idct_template.c
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@ -283,8 +283,8 @@ void FUNCC(ff_h264_chroma422_dc_dequant_idct)(int16_t *_block, int qmul){
dctcoef *block = (dctcoef*)_block; dctcoef *block = (dctcoef*)_block;
for(i=0; i<4; i++){ for(i=0; i<4; i++){
temp[2*i+0] = block[stride*i + xStride*0] + block[stride*i + xStride*1]; temp[2*i+0] = block[stride*i + xStride*0] + (unsigned)block[stride*i + xStride*1];
temp[2*i+1] = block[stride*i + xStride*0] - block[stride*i + xStride*1]; temp[2*i+1] = block[stride*i + xStride*0] - (unsigned)block[stride*i + xStride*1];
} }
for(i=0; i<2; i++){ for(i=0; i<2; i++){