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avcodec/hevcdsp_template: Fix undefined shift in put_hevc_epel_bi_w_h()

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Fixes: runtime error: left shift of negative value -127
Fixes: 4397/clusterfuzz-testcase-minimized-4779061080489984

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 0409d33311)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-11-30 21:27:37 +01:00
parent cead6c94c5
commit c8bbddf057
1 changed files with 1 additions and 1 deletions
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libavcodec/hevcdsp_template.c
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@ -1355,7 +1355,7 @@ static void FUNC(put_hevc_epel_bi_w_h)(uint8_t *_dst, ptrdiff_t _dststride, uint
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++)
dst[x] = av_clip_pixel(((EPEL_FILTER(src, 1) >> (BIT_DEPTH - 8)) * wx1 + src2[x] * wx0 +
((ox0 + ox1 + 1) << log2Wd)) >> (log2Wd + 1));
((ox0 + ox1 + 1) * (1 << log2Wd))) >> (log2Wd + 1));
src += srcstride;
dst += dststride;
src2 += MAX_PB_SIZE;