Why does CGPathRelease cause memory leak? - ios

Question

When I try to release a path it will cause a memory leak that is about 5 megabytes big. Every time i call CGreleasePath the ram memory usage will increase again by 5 megabytes. What could be the reason that is causing this memory leak?
This is the code where all my paths are getting used:
//viewcontroller.h
CGMutablePathRef path;
//viewcontroller.m
-(void)viewDidLoad{
path = CGPathCreateMutable;
timer = [NSTimer scheduledTimerWithTimeInterval:0.02 target:self selector:#selector(movement1) userInfo:nil repeats:YES];
timer2 = [NSTimer scheduledTimerWithTimeInterval:0.02 target:self selector:#selector(motor) userInfo:nil repeats:YES];
}
-(void)movement1{
CGPathMoveToPoint(path, NULL, greentmporary.x, greentmporary.y);
CGPathAddLineToPoint(path, NULL, greenpoint1.x, greenpoint1.y);
}
-(void)motor{
CGPathRef thickpath = NULL;
thickpath = CGPathCreateCopyByStrokingPath(path, NULL, (6+bigsizeYellow), kCGLineCapSquare, kCGLineJoinMiter, 0);
if (CGPathContainsPoint(thickpath, NULL, greenpoint1, NO) && krockamedgreen == NO) {
NSLog(#"YES");
[self reset]
}
if (CGPathContainsPoint(thickpath, NULL, point1, NO) && krockamedgreen == NO) {
NSLog(#"YES");
[self reset]
}
if (thickpath) {
CFRelease(thickpath);
thickpath = NULL;
}
}
-(void)reset{
path = NULL;
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
//start again
{
path = CGPathCreateMutable;
}