static MagickBooleanType DrawDashPolygon(const DrawInfo *draw_info,
  const PrimitiveInfo *primitive_info,Image *image)
{
  double
    length,
    maximum_length,
    offset,
    scale,
    total_length;

  DrawInfo
    *clone_info;

  MagickStatusType
    status;

  PrimitiveInfo
    *dash_polygon;

  register double
    dx,
    dy;

  register ssize_t
    i;

  size_t
    number_vertices;

  ssize_t
    j,
    n;

  assert(draw_info != (const DrawInfo *) NULL);
  if (image->debug != MagickFalse)
    (void) LogMagickEvent(DrawEvent,GetMagickModule(),"    begin draw-dash");
  for (i=0; primitive_info[i].primitive != UndefinedPrimitive; i++) ;
  number_vertices=(size_t) i;
  dash_polygon=(PrimitiveInfo *) AcquireQuantumMemory((size_t)
    (2UL*number_vertices+1UL),sizeof(*dash_polygon));
  if (dash_polygon == (PrimitiveInfo *) NULL)
    return(MagickFalse);
  clone_info=CloneDrawInfo((ImageInfo *) NULL,draw_info);
  clone_info->miterlimit=0;
  dash_polygon[0]=primitive_info[0];
  scale=ExpandAffine(&draw_info->affine);
  length=scale*(draw_info->dash_pattern[0]-0.5);
  offset=fabs(draw_info->dash_offset) >= DrawEpsilon ?
     scale*draw_info->dash_offset : 0.0;
  j=1;
  for (n=0; offset > 0.0; j=0)
  {
    if (draw_info->dash_pattern[n] <= 0.0)
      break;
    length=scale*(draw_info->dash_pattern[n]+(n == 0 ? -0.5 : 0.5));
    if (offset > length)
      {
        offset-=length;
        n++;
        length=scale*(draw_info->dash_pattern[n]+0.5);
        continue;
      }
    if (offset < length)
      {
        length-=offset;
        offset=0.0;
        break;
      }
    offset=0.0;
    n++;
  }
  status=MagickTrue;
  maximum_length=0.0;
  total_length=0.0;
  for (i=1; (i < (ssize_t) number_vertices) && (length >= 0.0); i++)
  {
    dx=primitive_info[i].point.x-primitive_info[i-1].point.x;
    dy=primitive_info[i].point.y-primitive_info[i-1].point.y;
    maximum_length=hypot((double) dx,dy);
    if (fabs(length) < DrawEpsilon)
      {
        n++;
        if (fabs(draw_info->dash_pattern[n]) < DrawEpsilon)
          n=0;
        length=scale*(draw_info->dash_pattern[n]+(n == 0 ? -0.5 : 0.5));
      }
    for (total_length=0.0; (length >= 0.0) && (maximum_length >= (total_length+length)); )
    {
      total_length+=length;
      if ((n & 0x01) != 0)
        {
          dash_polygon[0]=primitive_info[0];
          dash_polygon[0].point.x=(double) (primitive_info[i-1].point.x+dx*
            total_length/maximum_length);
          dash_polygon[0].point.y=(double) (primitive_info[i-1].point.y+dy*
            total_length/maximum_length);
          j=1;
        }
      else
        {
          if ((j+1) > (ssize_t) (2*number_vertices))
            break;
          dash_polygon[j]=primitive_info[i-1];
          dash_polygon[j].point.x=(double) (primitive_info[i-1].point.x+dx*
            total_length/maximum_length);
          dash_polygon[j].point.y=(double) (primitive_info[i-1].point.y+dy*
            total_length/maximum_length);
          dash_polygon[j].coordinates=1;
          j++;
          dash_polygon[0].coordinates=(size_t) j;
          dash_polygon[j].primitive=UndefinedPrimitive;
          status&=DrawStrokePolygon(image,clone_info,dash_polygon);
        }
      n++;
      if (fabs(draw_info->dash_pattern[n]) < DrawEpsilon)
        n=0;
      length=scale*(draw_info->dash_pattern[n]+(n == 0 ? -0.5 : 0.5));
    }
    length-=(maximum_length-total_length);
    if ((n & 0x01) != 0)
      continue;
    dash_polygon[j]=primitive_info[i];
    dash_polygon[j].coordinates=1;
    j++;
  }
  if ((total_length <= maximum_length) && ((n & 0x01) == 0) && (j > 1))
    {
      dash_polygon[j]=primitive_info[i-1];
      dash_polygon[j].point.x+=DrawEpsilon;
      dash_polygon[j].point.y+=DrawEpsilon;
      dash_polygon[j].coordinates=1;
      j++;
      dash_polygon[0].coordinates=(size_t) j;
      dash_polygon[j].primitive=UndefinedPrimitive;
      status&=DrawStrokePolygon(image,clone_info,dash_polygon);
    }
  dash_polygon=(PrimitiveInfo *) RelinquishMagickMemory(dash_polygon);
  clone_info=DestroyDrawInfo(clone_info);
  if (image->debug != MagickFalse)
    (void) LogMagickEvent(DrawEvent,GetMagickModule(),"    end draw-dash");
  return(status != 0 ? MagickTrue : MagickFalse);
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.