wallet: notify when preset + automatic inputs exceed max weight

This also avoids signing all inputs prior to erroring out.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/wallet/spend.cpp b/src/wallet/spend.cpp
index 4cbcfdb60f..2fce051f54 100644
--- a/src/wallet/spend.cpp
+++ b/src/wallet/spend.cpp
@@ -799,6 +799,13 @@ util::Result<SelectionResult> SelectCoins(const CWallet& wallet, CoinsResult& av
         op_selection_result->RecalculateWaste(coin_selection_params.min_viable_change,
                                                 coin_selection_params.m_cost_of_change,
                                                 coin_selection_params.m_change_fee);
+
+        // Verify we haven't exceeded the maximum allowed weight
+        int max_inputs_weight = MAX_STANDARD_TX_WEIGHT - (coin_selection_params.tx_noinputs_size * WITNESS_SCALE_FACTOR);
+        if (op_selection_result->GetWeight() > max_inputs_weight) {
+            return util::Error{_("The combination of the pre-selected inputs and the wallet automatic inputs selection exceeds the transaction maximum weight. "
+                                 "Please try sending a smaller amount or manually consolidating your wallet's UTXOs")};
+        }
     }
     return op_selection_result;
 }