To stop a ceiling leak coming from your roof, you need to address the root cause of the leak in the roof itself. While you can try to contain the dripping water with buckets or tarps, this is only a temporary measure. A qualified roofing contractor needs to inspect your roof to identify the source of the leak, repair any damaged shingles or flashing, and ensure the area is properly sealed. It's essential to address the roof leak to prevent further water damage and potential structural issues.