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avfilter/vf_palettegen: fix integer overflow
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@ -113,8 +113,8 @@ static int cmp_##name(const void *pa, const void *pb) \
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{ \
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const struct color_ref * const *a = pa; \
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const struct color_ref * const *b = pb; \
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return ((*a)->color >> (8 * (2 - (pos))) & 0xff) \
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- ((*b)->color >> (8 * (2 - (pos))) & 0xff); \
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return (int)((*a)->color >> (8 * (2 - (pos))) & 0xff) \
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- (int)((*b)->color >> (8 * (2 - (pos))) & 0xff); \
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}
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DECLARE_CMP_FUNC(r, 0)
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