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This PR modifies `named_reserve()` in frame-balances to use checked math instead of defensive saturating math. The use of saturating math relies on the assumption that the sum of the values will always fit in `u128::MAX`. However, there is nothing preventing the implementing pallet from passing a larger value which overflows. This can happen if the implementing pallet does not validate user input and instead relies on `named_reserve()` to return an error (this saves an additional read) This is not a security concern, as the method will subsequently return an error thanks to `<Self as ReservableCurrency<_>>::reserve(who, value)?;`. However, the `defensive_saturating_add` will panic in `--all-features`, creating false positive crashes in fuzzing operations. --------- Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com> (cherry picked from commit f373af0)
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Jan 29, 2025
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Backport #7365 into
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