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swscale: Fix an undefined behaviour

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Prevent a division by zero down the codepath.

Sample-Id: 00001721-google
Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
(cherry picked from commit 3a177a9cca924e097265b32f9282814f6b653e08)
This commit is contained in:
Luca Barbato 2014-05-02 00:21:23 +02:00 committed by Reinhard Tartler
parent 428b629eb2
commit a56a9e65c6
1 changed files with 1 additions and 1 deletions
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2
libswscale/utils.c
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@ -326,7 +326,7 @@ static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
xDstInSrc = xInc - 0x10000;
for (i = 0; i < dstW; i++) {
int xx = (xDstInSrc - ((filterSize - 2) << 16)) / (1 << 17);
int xx = (xDstInSrc - ((int64_t)(filterSize - 2) << 16)) / (1 << 17);
int j;
(*filterPos)[i] = xx;
for (j = 0; j < filterSize; j++) {