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avfilter/vf_premultiply: fix signed integer overflow 

Fixes #8324
This commit is contained in:
Paul B Mahol 2019-10-22 10:38:16 +02:00
parent 0b8956b25c
commit 5561a1de90
1 changed files with 2 additions and 2 deletions
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4
libavfilter/vf_premultiply.c
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@ -186,7 +186,7 @@ static void premultiply16yuv(const uint8_t *mmsrc, const uint8_t *aasrc,
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
dst[x] = ((((msrc[x] - half) * (((asrc[x] >> 1) & 1) + asrc[x]))) >> shift) + half;
dst[x] = ((((msrc[x] - half) * (int64_t)(((asrc[x] >> 1) & 1) + asrc[x]))) >> shift) + half;
}
dst += dlinesize / 2;
@ -209,7 +209,7 @@ static void premultiply16offset(const uint8_t *mmsrc, const uint8_t *aasrc,
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
dst[x] = ((((msrc[x] - offset) * (((asrc[x] >> 1) & 1) + asrc[x])) + half) >> shift) + offset;
dst[x] = ((((msrc[x] - offset) * (int64_t)(((asrc[x] >> 1) & 1) + asrc[x])) + half) >> shift) + offset;
}
dst += dlinesize / 2;