From 9bef02e36525d0eed4e2e31678b3ff04bbb0b8cb Mon Sep 17 00:00:00 2001
From: Suhas Daftuar <sdaftuar@gmail.com>
Date: Mon, 3 Apr 2017 15:50:15 -0400
Subject: [PATCH] Bugfix: ancestor modifed fees were incorrect for descendants

If prioritisetransaction was called for a tx with in-mempool
descendants, the modified ancestor fee values for those descendants was
incorrect.
---
 src/txmempool.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index 36a046ed2..0794a3902 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -912,6 +912,13 @@ void CTxMemPool::PrioritiseTransaction(const uint256& hash, const CAmount& nFeeD
             BOOST_FOREACH(txiter ancestorIt, setAncestors) {
                 mapTx.modify(ancestorIt, update_descendant_state(0, nFeeDelta, 0));
             }
+            // Now update all descendants' modified fees with ancestors
+            setEntries setDescendants;
+            CalculateDescendants(it, setDescendants);
+            setDescendants.erase(it);
+            BOOST_FOREACH(txiter descendantIt, setDescendants) {
+                mapTx.modify(descendantIt, update_ancestor_state(0, nFeeDelta, 0, 0));
+            }
         }
     }
     LogPrintf("PrioritiseTransaction: %s feerate += %s\n", hash.ToString(), FormatMoney(nFeeDelta));