Submitted by 0x4non, also found by kwhuo68, eierina, Deivitto, 0xNazgul, __141345__, imare, cccz, and rvierdiiev
Some tokens (like USDT) do not work when changing the allowance from an existing non-zero allowance value. They must first be approved by zero and then the actual allowance must be approved.
https://github.com/code-423n4/2022-12-tigris/blob/main/contracts/Lock.sol#L117
Add an approve(0) before approving;
Alex the Entreprenerd (judge) commented:
GainsGoblin (Tigris Trade) confirmed:
GainsGoblin (Tigris Trade) resolved:
