fix(fee-abstraction): drop Lazy-mode expiration check that validates the wrong value - #844
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…the wrong value collect_fee()'s Lazy branch only re-approves when the existing allowance already covers max_fee_amount. When it does, expiration_ledger is never applied to anything real — the else branch instead ran validate_expiration_ledger(e, expiration_ledger), which only checks that the *parameter passed to this call* is in the future. It has no relationship to the real allowance's actual expiration, which was set by whichever prior approve() call established it and isn't even readable through TokenClient (only the amount is, via allowance()). Two consequences, demonstrated by two new tests: - False rejection: a genuinely valid, non-expired real allowance (100 units until ledger 200, current ledger 101) still panicked with Error(Contract, #5006) if the unrelated expiration_ledger argument happened to be less than the current ledger sequence. - No real effect either way: an expiration_ledger nowhere near the real allowance's actual expiration (e.g. 9999 against a real expiration of 200) was accepted just as readily — there was never a tightening or loosening effect to preserve. The SAC's own transfer_from expiry enforcement already protects the real allowance on the line right after this branch; this check wasn't adding coverage transfer_from didn't already provide, only a false-rejection surface. Dropped the call in the else branch. validate_expiration_ledger itself stays public (still has its own direct unit test) — this only removes the one call site that was checking it against the wrong thing. The old collect_fee_with_lazy_approval_expired_ledger_panics test encoded the bug as expected behavior; replaced with two tests that assert the corrected behavior in both directions and keep the exact same setup so the fix's before/after is legible from the diff. Fixes OpenZeppelin#840. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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WalkthroughThe lazy approval path now skips expiration validation when the existing allowance covers the fee. Tests verify that expired or unrelated ChangesLazy approval expiration handling
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to The change is localized and supported by updated tests and passing checks; the only remaining follow-up is a minor test-harness consistency cleanup, with no actionable merge-blocking production risk. Possibly related PRs
Suggested reviewers: Poem
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Inline comments:
In `@packages/fee-abstraction/src/test.rs`:
- Line 261: In the allowance behavior test, replace
e.mock_all_auths_allowing_non_root_auth() with the standard e.mock_all_auths()
setup; leave authorization-specific mocking unchanged elsewhere.
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packages/fee-abstraction/src/storage.rspackages/fee-abstraction/src/test.rs
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| #[test] | ||
| fn collect_fee_with_lazy_approval_ignores_unrelated_expiration_ledger_param() { | ||
| let e = Env::default(); | ||
| e.mock_all_auths_allowing_non_root_auth(); |
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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win
Use the standard auth mock in this test.
This test verifies allowance behavior. It does not test authorization machinery. Replace e.mock_all_auths_allowing_non_root_auth() with e.mock_all_auths().
Proposed fix
- e.mock_all_auths_allowing_non_root_auth();
+ e.mock_all_auths();As per coding guidelines, “Use e.mock_all_auths() for tests unless the test specifically targets authorization machinery.”
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| e.mock_all_auths_allowing_non_root_auth(); | |
| e.mock_all_auths(); |
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only still-valid issues, skip the rest with a brief reason, keep changes
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In `@packages/fee-abstraction/src/test.rs` at line 261, In the allowance behavior
test, replace e.mock_all_auths_allowing_non_root_auth() with the standard
e.mock_all_auths() setup; leave authorization-specific mocking unchanged
elsewhere.
Source: Coding guidelines
coderabbitai flagged that this test doesn't exercise non-root authorization machinery (sweep runs inside e.as_contract(...) with no external require_auth() involved) and should use the standard e.mock_all_auths() mock instead of the non-root variant.
1 participant
Root cause, confirmed independently
collect_fee()'sLazybranch only re-approves when the existing allowance is already belowmax_fee_amount. When it isn't, theelsebranch ranvalidate_expiration_ledger(e, expiration_ledger)— which only checks that the parameter passed to this call is in the future. That parameter has no relationship to the real, on-chain allowance's actual expiration: it was already fixed by whichever priorapprove()call established it, andTokenClientdoesn't even expose it as a readable value (only the amount, viaallowance()).Ran the crate's own cited test (
collect_fee_with_lazy_approval_expired_ledger_panics) againstmainatfbfde38before touching anything: it panics withError(Contract, #5006), and the diagnostic event log showsallowance: 100at the moment of the panic — confirming the real allowance was genuinely sufficient and non-expired when the call was rejected. Then wrote two new, independent tests to isolate both directions the issue describes before writing this fix:expiration_ledger: 100 < 101— a false rejection.expiration_ledgerof 9999, nowhere near the real allowance's actual expiration of 200, is accepted just as readily as any other value — the parameter never reaches the real allowance either way.Both confirmed the bug is real and exactly as scoped, not an edge case or a misreading of the original report.
Fix (option a from the issue)
The issue's own "Suggested direction" left two paths open:
elsebranch — the SAC's owntransfer_fromexpiry enforcement, called two lines later in the same function, already protects the real allowance; this check wasn't adding coveragetransfer_fromdidn't already provide, only a false-rejection surface.Lazymode is meant to let a caller tighten an existing approval's expiration without bumping the amount, that needs an actualapprove()call when the expiration should change, not a validation of an unused parameter.This PR implements (a), the smaller and less debatable of the two — dropping the check entirely rather than changing
Lazymode's semantics.validate_expiration_ledgeritself is untouched and stays public (it still has its own direct unit test,validate_expiration_ledger_past); this PR only removes the one call site that was checking it against the wrong value. If the maintainers want (b) instead — real tightening via a conditionalapprove()— happy to rework this PR for that instead; flagging it here since it's a real behavior fork, not just an implementation detail.Tests
cargo test --libinpackages/fee-abstraction: 22/22 passing (20 pre-existing + 2 new).cargo clippy --all-targets --all-features -- -D warnings: clean.cargo +nightly fmt --all -- --check: clean.collect_fee_with_lazy_approval_expired_ledger_panicstest encoded the bug as expected behavior (#[should_panic]). Replaced withcollect_fee_with_lazy_approval_succeeds_regardless_of_expiration_ledger_param(same exact setup, now asserts success and the correct post-call allowance) andcollect_fee_with_lazy_approval_ignores_unrelated_expiration_ledger_param(the second direction — an arbitrary future param has no real effect).Fixes #840.
Summary by CodeRabbit
Bug Fixes
Tests