What is the ruling on shares purchased with money borrowed from an interest-based bank, and how should one dispose of them if they are unlawful?

Borrowing money from an interest-based (usurious) bank is Haram (definition) (unlawful) according to Islamic law. The borrower must repent to Allah, regret this sin, and resolve not to return to it. As for the shares purchased with this money, they are Halal (definition) (permissible), and there is no need to sell them or dispose of them after repaying the usurious loan and ending the forbidden contract.