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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: 241173056 + 1953511200 cannot be represented in type 'int'
Fixes: 26086/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_H264_fuzzer-5068366420901888

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 d1983628394e076001cc67d85656f9842b7282a3)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-10-15 21:35:43 +02:00
parent 25a5e10bf9
commit f5316d98a7
1 changed files with 1 additions and 1 deletions
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libavcodec/h264idct_template.c
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@ -278,7 +278,7 @@ void FUNCC(ff_h264_chroma422_dc_dequant_idct)(int16_t *_block, int qmul){
const int stride= 16*2;
const int xStride= 16;
int i;
int temp[8];
unsigned temp[8];
static const uint8_t x_offset[2]={0, 16};
dctcoef *block = (dctcoef*)_block;