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interfaces: Change getUnspentOutput return type to avoid multiprocess segfault

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Coin serialize method segfaults if IsSpent condition is true. This caused
multiprocess code to segfault when serializing the Coin& output argument to of
the Node::getUnspentOutput method if the coin was not found. Segfault could be
triggered by double clicking and viewing transaction details in the GUI
transaction list.

Fix this by replacing Coin& output argument with optional<Coin> return value to
avoid trying to serializing spent coins.
This commit is contained in:
Ryan Ofsky 2022-09-12 11:09:06 -04:00
parent 4978754c00
commit 156f49d682
3 changed files with 8 additions and 8 deletions
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4
src/interfaces/node.h
View file

@ -204,8 +204,8 @@ public:
//! Unset RPC timer interface.
virtual void rpcUnsetTimerInterface(RPCTimerInterface* iface) = 0;
//! Get unspent outputs associated with a transaction.
virtual bool getUnspentOutput(const COutPoint& output, Coin& coin) = 0;
//! Get unspent output associated with a transaction.
virtual std::optional<Coin> getUnspentOutput(const COutPoint& output) = 0;
//! Broadcast transaction.
virtual TransactionError broadcastTransaction(CTransactionRef tx, CAmount max_tx_fee, std::string& err_string) = 0;

6
src/node/interfaces.cpp
View file

@ -328,10 +328,12 @@ public:
std::vector<std::string> listRpcCommands() override { return ::tableRPC.listCommands(); }
void rpcSetTimerInterfaceIfUnset(RPCTimerInterface* iface) override { RPCSetTimerInterfaceIfUnset(iface); }
void rpcUnsetTimerInterface(RPCTimerInterface* iface) override { RPCUnsetTimerInterface(iface); }
bool getUnspentOutput(const COutPoint& output, Coin& coin) override
std::optional<Coin> getUnspentOutput(const COutPoint& output) override
{
LOCK(::cs_main);
return chainman().ActiveChainstate().CoinsTip().GetCoin(output, coin);
Coin coin;
if (chainman().ActiveChainstate().CoinsTip().GetCoin(output, coin)) return coin;
return {};
}
TransactionError broadcastTransaction(CTransactionRef tx, CAmount max_tx_fee, std::string& err_string) override
{

6
src/qt/transactiondesc.cpp
View file

@ -360,12 +360,10 @@ QString TransactionDesc::toHTML(interfaces::Node& node, interfaces::Wallet& wall
{
COutPoint prevout = txin.prevout;
Coin prev;
if(node.getUnspentOutput(prevout, prev))
{
if (auto prev{node.getUnspentOutput(prevout)}) {
{
strHTML += "<li>";
const CTxOut &vout = prev.out;
const CTxOut& vout = prev->out;
CTxDestination address;
if (ExtractDestination(vout.scriptPubKey, address))
{