policy/fees: remove a floating-point division by zero

Reported-by: practicalswift <practicalswift@users.noreply.github.com>
Signed-off-by: Antoine Poinsot <darosior@protonmail.com>

src/policy/fees.cpp

@@ -325,13 +325,22 @@ double TxConfirmStats::EstimateMedianVal(int confTarget, double sufficientTxVal,
         failBucket.leftMempool = failNum;
     }
 
+    float passed_within_target_perc = 0.0;
+    float failed_within_target_perc = 0.0;
+    if ((passBucket.totalConfirmed + passBucket.inMempool + passBucket.leftMempool)) {
+        passed_within_target_perc = 100 * passBucket.withinTarget / (passBucket.totalConfirmed + passBucket.inMempool + passBucket.leftMempool);
+    }
+    if ((failBucket.totalConfirmed + failBucket.inMempool + failBucket.leftMempool)) {
+        failed_within_target_perc = 100 * failBucket.withinTarget / (failBucket.totalConfirmed + failBucket.inMempool + failBucket.leftMempool);
+    }
+
     LogPrint(BCLog::ESTIMATEFEE, "FeeEst: %d > %.0f%% decay %.5f: feerate: %g from (%g - %g) %.2f%% %.1f/(%.1f %d mem %.1f out) Fail: (%g - %g) %.2f%% %.1f/(%.1f %d mem %.1f out)\n",
              confTarget, 100.0 * successBreakPoint, decay,
              median, passBucket.start, passBucket.end,
-             100 * passBucket.withinTarget / (passBucket.totalConfirmed + passBucket.inMempool + passBucket.leftMempool),
+             passed_within_target_perc,
              passBucket.withinTarget, passBucket.totalConfirmed, passBucket.inMempool, passBucket.leftMempool,
              failBucket.start, failBucket.end,
-             100 * failBucket.withinTarget / (failBucket.totalConfirmed + failBucket.inMempool + failBucket.leftMempool),
+             failed_within_target_perc,
              failBucket.withinTarget, failBucket.totalConfirmed, failBucket.inMempool, failBucket.leftMempool);
 
 

test/sanitizer_suppressions/ubsan

@@ -1,6 +1,5 @@
 # -fsanitize=undefined suppressions
 # =================================
-float-divide-by-zero:policy/fees.cpp
 float-divide-by-zero:validation.cpp
 float-divide-by-zero:wallet/wallet.cpp