wallet: Fix segmentation fault in CreateWalletFromFile

4 files changed, 25 insertions, 0 deletions

diff --git a/test/functional/data/wallets/high_minversion/.walletlock b/test/functional/data/wallets/high_minversion/.walletlock
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/test/functional/data/wallets/high_minversion/.walletlock
diff --git a/test/functional/data/wallets/high_minversion/db.log b/test/functional/data/wallets/high_minversion/db.log
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/test/functional/data/wallets/high_minversion/db.log
diff --git a/test/functional/data/wallets/high_minversion/wallet.dat b/test/functional/data/wallets/high_minversion/wallet.dat
new file mode 100644
index 0000000000..99ab809263
--- /dev/null
+++ b/test/functional/data/wallets/high_minversion/wallet.dat
diff --git a/test/functional/wallet_multiwallet.py b/test/functional/wallet_multiwallet.py
index 984ffab5a4..2d0a100ac4 100755
--- a/test/functional/wallet_multiwallet.py
+++ b/test/functional/wallet_multiwallet.py
@@ -17,6 +17,8 @@ from test_framework.util import (
     assert_raises_rpc_error,
 )
 
+FEATURE_LATEST = 169900
+
 
 class MultiWalletTest(BitcoinTestFramework):
     def set_test_params(self):
@@ -27,6 +29,13 @@ class MultiWalletTest(BitcoinTestFramework):
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()
 
+    def add_options(self, parser):
+        parser.add_argument(
+            '--data_wallets_dir',
+            default=os.path.join(os.path.dirname(os.path.realpath(__file__)), 'data/wallets/'),
+            help='Test data with wallet directories (default: %(default)s)',
+        )
+
     def run_test(self):
         node = self.nodes[0]
 
@@ -323,6 +332,22 @@ class MultiWalletTest(BitcoinTestFramework):
         self.nodes[0].unloadwallet(wallet)
         self.nodes[1].loadwallet(wallet)
 
+        # Fail to load if wallet is downgraded
+        shutil.copytree(os.path.join(self.options.data_wallets_dir, 'high_minversion'), wallet_dir('high_minversion'))
+        self.restart_node(0, extra_args=['-upgradewallet={}'.format(FEATURE_LATEST)])
+        assert {'name': 'high_minversion'} in self.nodes[0].listwalletdir()['wallets']
+        self.log.info("Fail -upgradewallet that results in downgrade")
+        assert_raises_rpc_error(
+            -4,
+            "Wallet loading failed.",
+            lambda: self.nodes[0].loadwallet(filename='high_minversion'),
+        )
+        self.stop_node(
+            i=0,
+            expected_stderr='Error: Error loading {}: Wallet requires newer version of Bitcoin Core'.format(
+                wallet_dir('high_minversion', 'wallet.dat')),
+        )
+
 
 if __name__ == '__main__':
     MultiWalletTest().main()