Clipping the current context so that it's masked by a path

Given a path which is drawn to the context and then converted to a CGImageRef, how would I clip the context (which has a supplied foreground image drawn) to it so that the said context is masked by the CGImage (that previously was a path)?

The code in question below should better illustrate my point if it's not totally clear. Note that all of this is called in a UIView's drawRect: method and that the scaledImageRectangle(UIImage *image, CGRect rect) function merely returns a rectangle.

    // Close the path
    CGContextClosePath(context);
    CGContextDrawPath(context, kCGPathFillStroke);

    // Mask the image
    CGImageRef mask = CGBitmapContextCreateImage(context);
    [foregroundImage drawInRect:scaledImageRectangle(foregroundImage, rect)];
    CGContextClipToMask(context, scaledImageRectangle(foregroundImage, rect), mask);

    // Finally draw the masked image
    UIImage *maskedImage = [UIImage imageWithCGImage:CGBitmapContextCreateImage(context)];
    [maskedImage drawInRect:scaledImageRectangle(foregroundImage, rect)];

For example, here is an image with the black stroke representing the path

And here is what the image would look like when masked