CVE-2020-27560: There is a Division by Zero in function OptimizeLayerFrames (#2743) · ImageMagick/ImageMagick@ef59bd7

@@ -1352,11 +1352,13 @@ static Image *OptimizeLayerFrames(const Image *image,const LayerMethod method,

if ( disposals[i] == DelDispose ) {

size_t time = 0;

while ( disposals[i] == DelDispose ) {

time += curr->delay*1000/curr->ticks_per_second;

time +=(size_t) (curr->delay*1000*

PerceptibleReciprocal((double) curr->ticks_per_second));

curr=GetNextImageInList(curr);

i++;

}

time += curr->delay*1000/curr->ticks_per_second;

time += (size_t)(curr->delay*1000*

PerceptibleReciprocal((double) curr->ticks_per_second));

prev_image->ticks_per_second = 100L;

prev_image->delay = time*prev_image->ticks_per_second/1000;

}