Improper design/implementation of SingleTokenJoinV2#joinTokenSingle() make it prone to fail

Handle WatchPug Vulnerability details for uint256 i; i bs.tokens.length; i++ IERC20 token = bs.tokensi; uint256 tokenAmount = balanceaddresstoken.mulamount.addfeeAmount.div totalSupply ; requiretokenAmount != 0, "AMOUNTTOOSMALL"; token.safeTransferFrommsg.sender, addressthis, tokenAmount; // If...