Objective C: Memory Leak issue in Class Method

I am hitting the memo开发者_StackOverflow中文版ry leak warning message as seen in the screenshot below.

I need some advise on how I can resolve this memory leak. Can I just do a [self release] at the end of the method?

You are not assigning the object returned to _sharedUserStockInfo so you are losing reference and leaking. Over that _sharedUserStockInfo will remain nil and method will return nil too.

+(UserStockInfo*)shareduserStockInfo{

     @synchronized([UserStockInfo class])
     {

         if(! _sharedUserStockInfo)
             _sharedUserStockInfo= [[self alloc]init];
         return _sharedUserStockInfo; 
     }

     return nil;
}