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gui: fix crash when closing wallet

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The crash occurs because 'WalletController::removeAndDeleteWallet' is called
twice for the same wallet model: first in the GUI's button connected function
'WalletController::closeWallet', and then again when the backend emits the
'WalletModel::unload' signal.

This causes the issue because 'removeAndDeleteWallet' inlines an
erase(std::remove()). So, if 'std::remove' returns an iterator to the end
(indicating the element wasn't found because it was already erased), the
subsequent call to 'erase' leads to an undefined behavior.

Github-Pull: bitcoin-core/gui#835
Rebased-From: a965f2bc07
This commit is contained in:
furszy 2024-09-12 18:50:43 -03:00 • committed by Ava Chow
parent d39262e5d4
commit 674dded875
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GPG key ID: 17565732E08E5E41
2 changed files with 13 additions and 8 deletions
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18
src/qt/walletcontroller.cpp
View file

@ -79,6 +79,14 @@ std::map<std::string, std::pair<bool, std::string>> WalletController::listWallet
return wallets;
}
void WalletController::removeWallet(WalletModel* wallet_model)
{
// Once the wallet is successfully removed from the node, the model will emit the 'WalletModel::unload' signal.
// This signal is already connected and will complete the removal of the view from the GUI.
// Look at 'WalletController::getOrCreateWallet' for the signal connection.
wallet_model->wallet().remove();
}
void WalletController::closeWallet(WalletModel* wallet_model, QWidget* parent)
{
QMessageBox box(parent);
@ -89,10 +97,7 @@ void WalletController::closeWallet(WalletModel* wallet_model, QWidget* parent)
box.setDefaultButton(QMessageBox::Yes);
if (box.exec() != QMessageBox::Yes) return;
// First remove wallet from node.
wallet_model->wallet().remove();
// Now release the model.
removeAndDeleteWallet(wallet_model);
removeWallet(wallet_model);
}
void WalletController::closeAllWallets(QWidget* parent)
@ -105,11 +110,8 @@ void WalletController::closeAllWallets(QWidget* parent)
QMutexLocker locker(&m_mutex);
for (WalletModel* wallet_model : m_wallets) {
wallet_model->wallet().remove();
Q_EMIT walletRemoved(wallet_model);
delete wallet_model;
removeWallet(wallet_model);
}
m_wallets.clear();
}
WalletModel* WalletController::getOrCreateWallet(std::unique_ptr<interfaces::Wallet> wallet)

3
src/qt/walletcontroller.h
View file

@ -85,6 +85,9 @@ private:
friend class WalletControllerActivity;
friend class MigrateWalletActivity;
//! Starts the wallet closure procedure
void removeWallet(WalletModel* wallet_model);
};
class WalletControllerActivity : public QObject