validation check on allowed amount wrong in withdraw function

[code423n4]

Lines of code

https://github.com/code-423n4/2022-07-swivel/blob/fd36ce96b46943026cb2dfcb76dfa3f884f51c18/Creator/ZcToken.sol#L112

Vulnerability details

validation check on allowed amount wrong in withdraw function

description

https://github.com/code-423n4/2022-07-swivel/blob/fd36ce96b46943026cb2dfcb76dfa3f884f51c18/Creator/ZcToken.sol#L112

the validation check if (allowed >= previewAmount) is incorrect as allowed should be greater than previewAmount

this will make withdraw always revert when using an allowance

if allowed < previouAmount the next line will revert

https://github.com/code-423n4/2022-07-swivel/blob/fd36ce96b46943026cb2dfcb76dfa3f884f51c18/Creator/ZcToken.sol#L115

recommendation

change the if statement to require

[JTraversa]

Duplicate of #129

[bghughes]

Duplicate of #129