https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6308

diff --git a/MagickCore/draw.c b/MagickCore/draw.c
index eac32d9ffdc11970e8021ca68962931d1a4ae6a6..cd48710e181721bc870e8082d917f2396f0fe695 100644 (file)
--- a/MagickCore/draw.c
+++ b/MagickCore/draw.c
@@ -3890,7 +3890,7 @@ static double GetFillAlpha(PolygonInfo *polygon_info,const double mid,
             }
           else
             {
-              alpha=1.0/alpha;
+              alpha=PerceptibleReciprocal(alpha);
               beta=delta.x*(y-q->y)-delta.y*(x-q->x);
               distance=alpha*beta*beta;
             }