From 545e85eccc2441c6d7745bb90d88dc14718455a2 Mon Sep 17 00:00:00 2001
From: Russell Yanofsky <russ@yanofsky.org>
Date: Thu, 15 Jun 2017 14:56:35 -0400
Subject: [PATCH] Add AssertLockHeld assertions in CWallet::ListCoins

---
 src/wallet/test/wallet_tests.cpp | 16 +++++++++++++---
 src/wallet/wallet.cpp            | 12 ++----------
 2 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/src/wallet/test/wallet_tests.cpp b/src/wallet/test/wallet_tests.cpp
index 14c5ad721..10e6da8b1 100644
--- a/src/wallet/test/wallet_tests.cpp
+++ b/src/wallet/test/wallet_tests.cpp
@@ -317,7 +317,11 @@ BOOST_FIXTURE_TEST_CASE(ListCoins, ListCoinsTestingSetup)
 
     // Confirm ListCoins initially returns 1 coin grouped under coinbaseKey
     // address.
-    auto list = wallet->ListCoins();
+    std::map<CTxDestination, std::vector<COutput>> list;
+    {
+        LOCK2(cs_main, wallet->cs_wallet);
+        list = wallet->ListCoins();
+    }
     BOOST_CHECK_EQUAL(list.size(), 1U);
     BOOST_CHECK_EQUAL(boost::get<CKeyID>(list.begin()->first).ToString(), coinbaseAddress);
     BOOST_CHECK_EQUAL(list.begin()->second.size(), 1U);
@@ -330,7 +334,10 @@ BOOST_FIXTURE_TEST_CASE(ListCoins, ListCoinsTestingSetup)
     // coinbaseKey pubkey, even though the change address has a different
     // pubkey.
     AddTx(CRecipient{GetScriptForRawPubKey({}), 1 * COIN, false /* subtract fee */});
-    list = wallet->ListCoins();
+    {
+        LOCK2(cs_main, wallet->cs_wallet);
+        list = wallet->ListCoins();
+    }
     BOOST_CHECK_EQUAL(list.size(), 1U);
     BOOST_CHECK_EQUAL(boost::get<CKeyID>(list.begin()->first).ToString(), coinbaseAddress);
     BOOST_CHECK_EQUAL(list.begin()->second.size(), 2U);
@@ -356,7 +363,10 @@ BOOST_FIXTURE_TEST_CASE(ListCoins, ListCoinsTestingSetup)
     }
     // Confirm ListCoins still returns same result as before, despite coins
     // being locked.
-    list = wallet->ListCoins();
+    {
+        LOCK2(cs_main, wallet->cs_wallet);
+        list = wallet->ListCoins();
+    }
     BOOST_CHECK_EQUAL(list.size(), 1U);
     BOOST_CHECK_EQUAL(boost::get<CKeyID>(list.begin()->first).ToString(), coinbaseAddress);
     BOOST_CHECK_EQUAL(list.begin()->second.size(), 2U);
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 7d46f0274..40ff06310 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2364,20 +2364,12 @@ void CWallet::AvailableCoins(std::vector<COutput> &vCoins, bool fOnlySafe, const
 
 std::map<CTxDestination, std::vector<COutput>> CWallet::ListCoins() const
 {
-    // TODO: Add AssertLockHeld(cs_wallet) here.
-    //
-    // Because the return value from this function contains pointers to
-    // CWalletTx objects, callers to this function really should acquire the
-    // cs_wallet lock before calling it. However, the current caller doesn't
-    // acquire this lock yet. There was an attempt to add the missing lock in
-    // https://github.com/bitcoin/bitcoin/pull/10340, but that change has been
-    // postponed until after https://github.com/bitcoin/bitcoin/pull/10244 to
-    // avoid adding some extra complexity to the Qt code.
+    AssertLockHeld(cs_main);
+    AssertLockHeld(cs_wallet);
 
     std::map<CTxDestination, std::vector<COutput>> result;
     std::vector<COutput> availableCoins;
 
-    LOCK2(cs_main, cs_wallet);
     AvailableCoins(availableCoins);
 
     for (auto& coin : availableCoins) {