Fix decrease allowance and add non-zero address precondition to approve #1293
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frangio
added
kind:improvement
contracts
nventuro
approved these changes
Sep 7, 2018
This was referenced Apr 15, 2019
wjmelements
reviewed
Dec 3, 2019
This is in reference to f306cc8 |
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decreaseAllowancenow requires the current allowance to not be larger than the amount to decrease. If the intent is to decrease the allowance to 0,approve(0)should be used instead.Fixes #437.
Additionally adds a check that an address is non-zero, which is the convention across OpenZeppelin.
Tests need fixed.