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Fix possible dust HTLC sweep tx when feerate remains unchanged during a bump #3832

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Merged
merged 1 commit into from
Jun 10, 2025
Merged

Fix possible dust HTLC sweep tx when feerate remains unchanged during a bump #3832

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4 changes: 2 additions & 2 deletions lightning/src/chain/package.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1365,11 +1365,11 @@ impl PackageTemplate {
predicted_weight, input_amounts, dust_limit_sats, self.feerate_previous,
feerate_strategy, conf_target, fee_estimator, logger,
) {
return Some((input_amounts.saturating_sub(new_fee), feerate));
return Some((cmp::max(input_amounts.saturating_sub(new_fee), dust_limit_sats), feerate));
}
} else {
if let Some((new_fee, feerate)) = compute_fee_from_spent_amounts(input_amounts, predicted_weight, conf_target, fee_estimator, logger) {
return Some((cmp::max(input_amounts as i64 - new_fee as i64, dust_limit_sats as i64) as u64, feerate));
return Some((cmp::max(input_amounts.saturating_sub(new_fee), dust_limit_sats), feerate));
}
}
None
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