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I\'m having a similar problem. The pointer from the malloc in create_bitmap
This really helped me! Here's how I used it to fix that nasty leak problem:
CGImage *cgImage = CGBitmapContextCreateImage(context);
CFDataRef dataRef = CGDataProviderCopyData(CGImageGetDataProvider(cgImage));
CGImageRelease(cgImage);
image->imageRef = dataRef;
image->image = CFDataGetBytePtr(dataRef);
Notice, I had to store the CFDataRef (for a CFRelease(image->imageRef)) in my ~Image function. Hopefully this also helps others...JR