Merge #10885: Reject invalid wallets

d84e78e [wallet] Specify wallet name in wallet loading errors (John Newbery)
a6da027 Reject invalid wallet files (João Barbosa)
3ef77a0 Reject duplicate wallet filenames (João Barbosa)

Pull request description:

  This PR prevents loading the same wallet more than once in a multi wallet scenario. It also prevents loading with invalid files: non regular files or symlinks.

Tree-SHA512: 45bf814096bb788db1c76ff334e679a10686cee7d9c8cd48fe5d924031353ace271f6fb0d4af49a34246d336945515c176920a552be7b9fbe07ab8e00e5f6e5e

1 files changed, 18 insertions, 3 deletions

diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 3e9c531f0..36c295e5d 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -468,11 +468,26 @@ bool CWallet::Verify()
 
     uiInterface.InitMessage(_("Verifying wallet(s)..."));
 
+    // Keep track of each wallet absolute path to detect duplicates.
+    std::set<fs::path> wallet_paths;
+
     for (const std::string& walletFile : gArgs.GetArgs("-wallet")) {
         if (boost::filesystem::path(walletFile).filename() != walletFile) {
-            return InitError(_("-wallet parameter must only specify a filename (not a path)"));
-        } else if (SanitizeString(walletFile, SAFE_CHARS_FILENAME) != walletFile) {
-            return InitError(_("Invalid characters in -wallet filename"));
+            return InitError(strprintf(_("Error loading wallet %s. -wallet parameter must only specify a filename (not a path)."), walletFile));
+        }
+
+        if (SanitizeString(walletFile, SAFE_CHARS_FILENAME) != walletFile) {
+            return InitError(strprintf(_("Error loading wallet %s. Invalid characters in -wallet filename."), walletFile));
+        }
+
+        fs::path wallet_path = fs::absolute(walletFile, GetDataDir());
+
+        if (fs::exists(wallet_path) && (!fs::is_regular_file(wallet_path) || fs::is_symlink(wallet_path))) {
+            return InitError(strprintf(_("Error loading wallet %s. -wallet filename must be a regular file."), walletFile));
+        }
+
+        if (!wallet_paths.insert(wallet_path).second) {
+            return InitError(strprintf(_("Error loading wallet %s. Duplicate -wallet filename specified."), walletFile));
         }
 
         std::string strError;