FeeMath Line 169
The scaleFactor of a market is multiplied by the fee rate to increase the scale. In a very rare edge case, where a market has a 100% interest (e.g., a junk bond) and is renewed each year with the borrower paying lenders the full interest, the scale factor would overflow after 256 years (as the scale factor doubles every year) when it attempts to increase during the withdrawal amount calculation.
While this issue is unlikely to occur in practice, a check should be added in the withdrawal process to prevent an overflow. If an overflow is detected, lenders should be forced to withdraw with a scale factor of uint256.max, and the borrower should close the market.
