Memory leak in NSString stringWithUTF8String: with ARC enabled

Question

In my application i have enabled the ARC. But in my application following lines gives me memory leaks according to instruments. It is in ios 7.0.

-(id)init{
    variables = [[NSMutableArray  alloc] init]; // Leak
    events = [[NSMutableArray  alloc] init]; //Leak
    return self;

}

Update

But in my app if i do something like below it does not show me any leak. But i can't add items in to the variables.

-(id)init{
    variables = [[[NSMutableArray  alloc] init] copy]; // No Leak
    events = [[[NSMutableArray  alloc] init] copy]; //No Leak
    return self;

}

--

NSString *utfString =[NSString stringWithUTF8String:(const char *)attr->children->content];//Leak

--

-(NSObject*)createObjectForClass:(NSString*)className{
    Class cls = NSClassFromString(className);
    NSObject *object = [[cls alloc]init]; //Leak
    if(cls != nil){
        CFRelease((__bridge CFTypeRef)(cls));
    }
    return object;
}

Does anyone has any idea how to fix this?

Answer 1

My guess right now is that your entire object is leaking, which means that the NSMutableArrays created in -init also leak. The version that calls copy isn't leaking because the copy is probably returning a singleton instance of NSArray (as there are zero elements in it, and it's an immutable NSArray, there's probably a singleton instance for that).